Hiya,
I was using an injector for the six months previous to starting my DE journey, but had no problem with the adjustment to a heavier razor and larger head design. Heh, I had found my perfect injector/blade combo, and resisted trying a DE for a long time. I still remember thinking how damn clunky those Gillettes looked, especially the Fatboy.
For those of you who haven't tried injectors, there's a lot to be said for em. They do take some skill, and the shave can be quite nice. Things like prep, lather, and technique apply with an injector, and it's great for making an easy transition to a DE. Oh yeah, the head profile is extremely thin, which makes trimming facial shrubbery a snap. Heh, I still get my Schick adjustable out for a nice change of pace shave.
One thing I had to figure out with e DE was that pressure thing. Yeah, an injector weighs almost nothing, so you gotta bear down a bit to keep the blade from chattering. As you know, that's not quite the same situation as with a DE. I gotta say, having the extra weight is a nice feature.
Martin