How to manage exports when editing lots of videos?
I would suggest you take a look at DaVinci Resolve 14 and see if it can cover what you need.  It depends on what editing you need to do as there aren't much in the way of filters available in the free version of Resolve, but it has a reasonable basic NLE and supports a batch renderer.

Virtually any decent professional software offers batch render support, but many of them have costs associated with them.  Resolve is the best free option I have personally used (though I have the paid studio version.)