Broken In
I've definitely adapted, as well. After using it, it seems bumpier, and my thumbs have gotten used to rocking back and forth between adjacent keys to type them, which is really quite fast!
It's also been better since I installed the HTC_IME keyboard so that I have predictive typing.
Basically, if I'm knocking out a text under 100 characters, I'll use the portrait software keyboard, but for anything else, I immediately go for the hardware one. Besides, I like the balance and feel of the phone better with the slider open.