You may have found your answer, but I wanted to add my two cents:

My first clipless ride, I did about 24 miles (a distance I'd done before), but without having ridden for a few months.
My quads were happy...at least, less sore than they had been for that distance with that long a break. My hamstrings were screaming at me when I got off the bike. I certainly utilized that ability to pull up that does tax your hamstrings, so my quads got a break while my hamstrings had to do more work than they were used to.