Just a simple fixed height for me. My projects take 10 years, so no point in a hydraulic lift
But if I had a larger space, I'd have a hydraulic lift in a heartbeat. Roll on, lift, work, lower, roll off. Would be magic.
Mine is dead simple. 3/4" plywood, 2x4 frame, 4x4 posts in the corners and 2x4 frame/plywood on the bottom as well.
The bottom acts as a shelf, but I could also flip the thing over once the top gets really nasty.
Casters in each corner under the posts.