1. Yes Sense does make things a little simpler (and more complex at the same time) and does look a lot more polished than stock Android (ie Droid)
2. Yes Incredible is a lot lighter than Drid, a little too light for my taste but your opinion may differ. You will have to check this out for yourself.
3. I agree that the phone physically feels cheap UNTIL you turn it on and see what a powerhouse it is
4. The width difference is millimeters and probably wont be noticeable.
5. Actually it's not that bad. It is definitely less than the Droid is now that I have the batteries broken in on it (I have two) but I've been pleasantly surprised with Incredible thus far. Droid is A LOT easier to take the back off to swap batteries though...
6. The screen in daylight is really about the same as the Droid in my experience. Neither is ideal but they are usable. You aren't gonna find one that you don't have issues with at all.
7. "Good" so relative. Droid is bulky yes, but Incredible feels light and cheap in the hand. I've ordered a silicone backer for it and hope that helps.