My first car, a 1974 Cadillac, had enough room under the hood, even with a 500 cid V8, that you could almost curl up under there and nap. Or keep a spare Prius there for emergency transportation.
But I seem to remember that the passenger side back plug was a pain to get out–as I recall, part of the HVAC system was in the way.
The easiest by far that I’ve owned is my old 1994 Chrysler LHS–all the plugs are right on top, pretty much vertical, and accessible through tubes in the valve covers, hemi-style. With a long extension, they come right out, no problem. I can do the whole set in 20 minutes or so. One of the worst I had was an 80s Ford LTD–The passenger side back plug was horrid to reach as I recall. You pretty much had to just pack a lunch and expect some lacerations to get that one out.