I'm using Adobe Premiere. Occasionally After Effects for motion graphics.
For editing my own footage, my current machine is mostly fine because I'm shooting Prores (Z Cam). I started off more as an editor, so I tend to prioritize edit-friendly cameras for my own purchases. However others don't do this so much, and the latest gen of cameras (R5, A7sIII, C70) are going to be a much bigger strain for editing supplied footage.
I'm not always editing my own work either - I've just started as lead editor an 8x22min series and the footage supplied is a mix of Red, Blackmagic, GH5 and GoPro. This is going to be tough for my current system, though thankfully I'm not having to deal with those latest codecs just yet. I'm trying to avoid proxies for this one as we'll be bouncing projects around between editors quite a bit, and I don't want things going offline constantly when switching between different machines.