Been using touchscreen BB since the storm. Truly a horrible machine, hardware-wise, and the storm 2 wasn't much better. But, and I suspect I may be in a minority, I still prefer my storm 2 touchscreen to my SGS2 for one simple reason - the hardware "click". I've lost count of the number of times I've cursed at Android for following a link (i.e. picking up a 'click') when I'm actually just trying to scroll. Never happened on the BB, not even once.
As for bb and "keyboard-centeredness" I came from a Bold 9700 to the Storm, and if I had a time machine and could go back, I'd give up the keyboard in exchange for display real-estate again in a heartbeat, despite the shortcomings of the storm. I did curse, throw fits and desperately miss the physical keyboard for a couple of weeks but after that, I became accustomed to the touch keyboard and now don't miss the physical keyboard at all...
I'm not convinced the keyboard alone accounted for "80% of the popularity". For me I could care less - it's BBM and Push/Notifications that make it my choice of 'business' phone.