Actually, I'm using both versions, and the biggest help to me is being to enter the SQL directly into a "Command" object. I've been jumping through hoops to do a Union query in CR 8.5 (ended up using a stored procedure). I'm using one even as I type this, in CR 9. We're also using the template option, and the attempt at a block comment in the formula editor is nice, too!
BEWARE, if you edit a CR 8.5 report in CR 9, you have to save it as a CR 9 report, and you can't use it in CR 8.5 any more!
Hope this helps,
Chuck