Pancake timelines technique
Some editing programs allow you to have multiple timelines in the same project. Those programs usually also allow you to have multiple timeline panels. So you can put two timelines on top of each other and use one for clips instead of having all of your clips hanging around on the main timeline. Here's Adobe's official tutorial on this technique
Continuous thumbnails
You can enable continuous thumbnails in Premiere and Vegas Pro (and maybe others) which means your clips will show more thumbnails on the timeline than just two at the start and end. Just try it you'll get it. It can lower performance on lower end systems or with hard to decode codecs.
Output scaling in DaVinci Resolve
You can change the way Resolve behaves when rendering in non matching resolutions. The same setting also exists for "input scaling" aka the media you add on the timeline.
