I agree, I've always slid the follower down by thumbing the nub on the follower out the side of the mag down as you mention. Fired 500 in a day a few times and no sore thumbs.
As for the pistol, best rimfire automatic made, have a pair of stainless Mark II's and have owned several others previously. The Mark II is the best of the three, has the last shot hold open, but none of the safety junk (loaded chamber indicator, magazine disconnect), the less crap in the receiver the better. I do like the MkIII mag release however, and ordered a VQ target grip frame to allow use of MkIII mags with my Mark II receivers. I wouldn't turn my nose up at a MkIII, great gun, I just prefer less nonsense. The safety nonsense is probably worth dealing with given the better mag release if you don't want to build a $1,000 Mark II like I have with the VQ frame to take MkIII mags.