I use the trimmer quite a bit during an edit.
There’s a setting in preferences for double-clicking a clip to open in the trimmer…
I usually drag through and create a loop section – I hit tab for video only, audio only, or both. Then I drag that section to the timeline and fine tune.
I wish there was a way to make markers in the trimmer – that would make things go even quicker. Mark, mark, draw loop – place.