One caveat I'll mention with regard to all of us stating that it's easy to wheel a lift around: that's without a heavy car on the runways. Heck, even with a 1,200 lb car on the runways, it requires significantly more effort to roll the lift around, particularly with regard to getting the casters to point the direction you want them to.
The lifts with ramps that connect via a tongue are simple to remove; just lift the ramps off. That said, I don't bother taking mine off unless I'm working right there at the back of the lift (diff installs, trailer hitch installs, exhaust work, etc.). If you have a habit of walking into things, maybe regular removal of the ramps would be best. The lifts that have the hanging ramps are more of a PITA. I'd skip those anyway, as the hanging ramps block access to storing a car beneath the lift.