I'm not sure any VCS scales well to huge repos, and the MSFT work in this space is truly amazing. I love, for example, their use of a Bloom filter to make git

I'm not sure any VCS scales well to huge repos, and the MSFT work in this space is truly amazing. I love, for example, their use of a Bloom filter to make git blame fast! I actually like the git UI. Like many git power users, I've come to terms with a subset of the UI that I know how to use very well. The thinness of Git's abstractions lets me think of complex VCS operations as I do when reading or writing code. If the cognitive load is too high, you can always just use a merge-heavy workflow and stop thinking about the mechanics, but I recommend instead to understand the mechanics. The data model in Git is hardly more complex than Fossil's or Mercurial's, and it's copy-on-write all the way, which makes it very safe (think ZFS).