They are probably referring to:
1. Infinite unit selection (SC1/BW were capped at 12, this is doubly important for buildings).
2. Rally workers directly to mineral patches
3. Smart cast for spells (pairs with #1 to allow you to cast spells more easily)
4. Better unit control, more deterministic
5. Removed high ground advantage (SC1/BW 50% hit chance up hill).
Maybe others... that said, anyone that pays attention to both games knows that the lack of complexity in unit and macro mechanics in SC2 leaves room for other actions, such as more intense "micro" mechanics. Neither game is more demanding then the other, it turns out in both games you never run out of things to do.
Maybe others... that said, anyone that pays attention to both games knows that the lack of complexity in unit and macro mechanics in SC2 leaves room for other actions, such as more intense "micro" mechanics. Neither game is more demanding then the other, it turns out in both games you never run out of things to do.