All the time.

I always have a bit of a "come down" like "OMG that book was SO SO good, how am I ever going to read anything better!?", and it can sometimes cause me to spin my wheels for an hour or a day when trying to choose the next book I want to read, because I over-analyze the stuff on my "want to read" list to find something that's going to be equally amazing and not feel like a relative let-down lol.