ALL of the Disney BDs have the opening trailers "feature", and many of them have the problem of freezing if you hit menu to skip. I had both Ratatoullie and Pirates of the Caribbean freeze on me, but no others so far, and each of them worked after I ejected them, reinsterted them and ran them again with skip instead of hitting menu.
The PS3 is pretty fast with all discs, so no big deal. My A2 was MUCH slower accessing menu items, esepcially while the movie was playing. With BD, almost all of your menu items are accessed during playback - one movie I noticed that doesn't do this is Nightmare Before Christmas - the menu operates like a SD DVD, but it is the only one I have seen like this so far (and it is disappointing). There can sometimes be a lag, but with the PS3 I don't notice any at all, though as jostenmeat mentioned, it depends on the movies themselves and how complex the pop up menus are. With my Dad's Insignia player, I did notice that menu access was a little slower - noticeable, but not annoying nor as slow as my A2 was. The ability to access most anything from the menus via pop-up menus is a far better option than having to go to the menu IMHO, and the cool thing is, if you watch some featurette, trailer, etc... when it is done, it returns to the movie where you were.