LOL!
My guess is that a lot of people try to just pick up a tool and bang away at it, with no training and little effort to study it first. As a result they often have little concept of the tool's power and limitations.
It is a lot like people who think they know Word, then when you get a document from them you find they've put hard-returns at the end of each line of text and sort of randomly use tabs and spaces to get things to "line up" - only to cry when they try printing on a different printer and it all falls apart. And watch the fireworks when you ask them to revise anything!
IMHO nobody should even bother trying to do ASP without InterDev, especially if they are building actual Intranet applications that use a lot of database access and need to display tables of the resulting data. Databound controls are wonderful timesavers and you can use them to gain a lot of power with a small effort. Of course you have to actually understand the tool first. The design-time controls are complex and powerful.
I'm often amazed at what people produce in ASP with a lot of heavy low-level plinking around. They sometimes get some really good stuff. But again try asking them to revise it and they'll burst out in tears! They use tons of hand-coded loops, often they'll have oodles of <% %> brackets all through the darned HTML, you get a maintenance nightmare! There is a lot of low-productivity ASP out there.
These people are going to die when they move to ASP+ (now called ASP.Net). You just can't hack and slash anymore. You have to write your code separately from your HTML, much as with VB6's WebClasses. That's really what ASP.Net is: VB6 WebClasses, enhanced and extended, and made available in other languages besides VB through the use of the CLR instead of the VB6 runtime.
Ok. But if you have a medium-sized ASP site to build you need a consistent look and feel, as well as navigation. This is NOT where InterDev shines. For this you use FrontPage.
As a matter of fact, you use FrontPage Themes! No, not the silly "personal web site" themes that come with the product. You need to create your own. Usually you'll need to hand-build the banner, misc, and button graphics, but you have that to do with any decent site.
The whole site should be constructed and maintained as a FrontPage web. I create the web initially in InterDev to get all the proper component directories built and populated. Then I open the same web in Frontpage and start working. Once the theme is built, the navigation structure set up, the web map built, and the pages fleshed out as HTMs... it is time for InterDev again. This is where you change individual HTMs to ASPs and begin adding the logic.
From there you do nearly all look/feel changes and add new pages or navigation in FrontPage. Even a lot of simple ASP maintenance can be done in FrontPage. But if you need to rework a lot of code or add new ASP functionality, it's back to InterDev.
The tools complement each other well.
You can use another HTML edting tool along with InterDev, but very few of them are properly "aware of" ASP issues.
Now if you have just a few ASP pages to hack out here and there you can use other tools, and there are a few high-end tools that really do understand what ASP applications are all about. But once again IMHO the combination of FrontPage and InterDev is hard to beat for ASP development.
As with any tool though, you have to really understand it to take advantage of it. I use NotePad myself for many chores - it is hard to beat for simplicity and quick/dirtyness. But it can be like building a house with just a hammer and saw. Frontpage and InterDev give you power tools and modular components. Who builds their windows and doors and plumbing fixtures from scratch with hammer and saw? Nobody.
And so the NotePad-based ASP dveloper ends up with tarpaper shack applications that need a lot of patching, that tend to fall down a lot, that don't meet code, have no running water or heat, and that no woman would want to live in ;-)
But if all you need is a doghouse... well why the heck would you make the invesment in learning carpentry and buying expensive tools? The hammer and saw are all you really need.
But I'll bet these NotePad-johnnies don't know what _scriptlibrary is for, don't use the PageObject object, and have probably never heard of Remote Scripting! Luckily ASP.Net will help by giving them this stuff by magic. But only if they use the .Net IDE instead of NotePad!
The moral: There is a heck of a lot to learn about this stuff. And it takes more time than I have! Somebody teaches me something new almost every darned day.