As was stated before by myself and many others, there are better ways to fix that issue than jumping, mainly through improving collision detection and terrain hang-ups. That or SE can just make the piddly little inclines huge cliffs and that also solves the issue.
Also as an aside, people complained about being blocked by chest high walls in XI. The thing about those is that they were put there intentionally. If they had jumping in that game they'd just make the wall higher. It needs to be clear that there is a difference between "You aren't supposed to go there," and just the terrain being stupid.