Other than the fact the DM can flat decide a character succeeds or fails without an dice being rolled, the biggest difference I see, coming to 5E from 3.x (having skipped 4e, I don't have that as a basis for comparison) is that 3.x had skills that couldn't be used untrained, so the DM could call for a skill check a player legally could not roll on. In 5E, pretty much every ability check, everyone can roll on (barring the DM deciding otherwise, of course). While I agree that changes the expectations, at least around the edges (if you can roll, you have a chance), I'm not sure how or how much it does so, and I'm not convinced that thinking of (for example) WIS(Perception) as "Perception" changes play at the table--though I'll admit that using the right terms--in this case WIS(Perception)--makes it easier if the DM is going to start asking for non-standard checks, like STR(Intimidation) or INT(Mason's tools).