I have bikes with both folding and removable pedals. I can remove the removables faster than I can fold the folders. The thing about the removables is remembering to bring them. It's easy in the course of loading and unloading your vehicle to forget the pedals and then find they are separated from your bike by some distance! I have been considering getting extra couplers and mounting them to the rear rack so that I will have a means to store the pedals on the bike while they are dismounted from the cranks.
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I came to say I must be folding . . .
Dahon Jetstream XP
Dahon Helios SL
Strida 5.0
Twenty project
— or not . . .
Fisher Mt. Tam (c.1988)
Merlin Road flat bar project
Schwinn Twinn Deluxe