I use platforms all the time and like them well enough. Perhaps one day when I get a road bike I'll try the new fangled pedals, but I enjoy my rides (which are all less than an hour anyhow) just fine the way they are.

The limitation of my platforms is slipping at high cadence. I lose grip when I try to pump it up above 85 rpm or so for anything over a couple of minutes. I tend to go btw 65 and 75. I know that's not optimal, but I just can't get going for long in a nice cadence above that. I brought it up in case others have different experience--do you regularly crank at higher rpm with platforms? Any secrets to share?