This looks great if you need multi-track, but if you don't, another app I highly recommend is Rougue Amoeba's Fission. It's quick and simple, and it edits audio losslessly wherever possible.

I actually really wish I had something similar for video...

Try this: https://github.com/mifi/lossless-cut

I am using the binary on macOS. The UI is a bit idiosyncratic but it works quite well and is ideal to cut a video down to the essential parts without loss of quality.