I found that initially I couldn't feel the location of the shifter (my old boots were A* fastlanes, so very soft) and was sort of just feeling around in the dark to make shifts.
It only took me a few days to develop new muscle memory for where to rest when I'm not shifting, where to reach to shift and downshift.
The feeling is definitely better than it was the first few rides. I think your nervous system recalibrates to the new input levels, and you'll begin to feel it again. For a while, you may just need to smack it confidently up to shift, until you start to get a feel for the new setup.
Never ride faster than you can stop