I, am also at a loss to understand why the walk around is such a big deal. I actually enjoy them. Unless it is pouring buckets outside, then the A isn't likely to do them anyways. To be perfectly honest, the only guy I had flown with that wanted to do half, actually was kind of annoying!
About the only parts of getting of the ground that bugs me, is when the Capt, arrives at the plane 20 minutes to push and chastises me for doing both preflights, and the other one is, when they get to the FD 10 minutes prior to push and start reading notams! I am sure there are times when it is unavoidable, but being late out of the gate, every push gets old, quick.