Around here (Chesapeake Bay) what we call "bay boats" have a certain popularity with mature cruisers. Based on deadrise crabbing and charter boat designs, they carry weight, motor at 15 knots on a single engine, and are well shaped to deal with the characteristic Chesapeake Bay chop. If you buy one for cruising they stretch the cabin and change the interior.
Long and somewhat slender, with a sharp rise forward but flat sections aft. Faster than a trawler and smoother than an express cruiser. Reasonable fuel consumption or they wouldn't use them for fishing.
As for cruising, if I become either too frail or just tired of the work, I'll probably just motel hop and take a kayak. I don't think power would solve the problem. I would probably be tiered of long days on the water and want a more shore-focused expereince.
But I'll post on that in 20 years, if the fates are willing.