We moved from 25' a couple of years ago to a beautiful 32' (tip to tail) KZ Spree. Even after 9 or 10 camping trips it still feels HUGE, both inside and when towing.
One thing we noticed is we've classed ourselves out of some campgrounds because of length. Especially in BLM and National Forest campgrounds. For example we were in Black Canyon NP last month and of 88 sites there, only 13 were identified as being big enough for us.
That means more advance planning and researching before taking off.
We really like the space we've got, but our next TT will be smaller... I'd like apposing slides for space, but an overall length under 30'.
But we'll see. :)