Couple of things in the Special Edition ANH I do like-
More sky traffic- it doe help make the place look like a space port instead of a back lot. Adding the Outrider was a fun nod.
While it does alter pacing, seeing the Falcon lift off with the engines at 'hot-ready'. The lurching motion also help with the idea this is a hurried getaway, not a casual lift off.
The X-Wings leaving for battle- much more dynamic shot and the flights look like individual pilots instead of a repeated SFX.
Things I wish they had not done-
As mentioned,adding the humor and Rontos into the Mos Eisley scene.
Seeing the Sentinel class troop transport was nice, but the extended shots of the STs searching was distracting. If they all arrived with that shuttle as implied, where did the guy on the Dewback come from?
Forgot to add the shadow underneath the Falcon when it arrives at the Rebel base.
Most of the other comments above I agree with, the biggest issue seems to be when they added/extended scenes for those 'look at that' moments they lost the crisp pacing of the original.
Interesting Project:
https://swrevisited.wordpress.com/anhr-change-list/
This in my opinion is one of the best versions of the film out there- unofficial but he corrects/improves on the movie, doing the things that ILM should have done in the first place.