I've used touch devices since 2001. My first iPaq had a near standard-sized keyboard that I could attach to the data port and take notes and create documents. Even then I knew that doing work on a small screen was difficult at best and that using a physical device was much simpler than a virtual one.
Fast forward to just a few months ago and here I was making excuses for my HTC Touch, it's small screen and its virtual (on-screen) keyboard.
Since getting the DROID, I have not looked back, nor have I had ANY desire to use ANY on-screen, virtual keyboard at any point.
When I take the DROID out of my pocket, I don't even touch the power button. That's far too difficult. Instead, since I'll probably be using the keyboard anyway, I just slide the keyboard open, which turns the screen on. For me, that's the same amount of steps that it takes to locate and press the power button.
How easy is it to just slide the phone open and it's on??
As far as usability goes, I think the size is slightly awkward, but my average sized, man-hands (size large glove) seems to thumb the keyboard just fine.
I send text messages at teenager speed and am able to play emulators as if I were on a PC with no joystick. Web browsing has never been more enjoyable and I feel like I don't have a need for a laptop any longer as the DROID does everything I could ever want as far as mobility goes.