I don't actually think I've been at a seated venue since Great Big Sea in gr. 7. That said I'm going to be seated for Dan Mangan in a couple weeks. Tickets were still decently cheap but I would much rather be able to force my way to the front.
That said I can see it's advantages... I'm not even 5'5 so I've had a bunch of concerts where I basically can't see a thing. Lots of concerts people aren't dancing around or anything so I don't think being seated would take away from the experience too much.