Caged or quill pedals are not platform pedals; I have Performance Campus pedals on my 'bent and I use the SPD side almost all the time but occasionally use the plain cage side to ride in sneakers. I also put Campus pedals on my singlespeed hybrid that get ridden short distances and use the plain caged side most of the time.
I used Power Grips for a year or two (with caged pedals) as a transition from toe clips (on a variety of traditional platform and caged pedals). Using Power Grips or toe clips would be a step backwards.