I do my best not to ride anything over 25lbs, its just no fun, especially when climbing is your favorite part of riding.
When I really got into bicycles though it was cause of vintage single speed "cruisers", my heaviest had to be at 40lbs and I rode it a lot, I started doing such long rides it just sorta made sense to go out and get a geared road bike so thats what I did, and though they are much lighter Ive/I suffered/suffer way more than I ever could on one of those 40 pound beasts!