Yes, I sometimes spend way to much time in Trello, it's the only app/system i've ever stuck with.
Sometimes I can spend much longer than I would like to admit, 'figuring things out' writing things down, going through a lot of thoughts then organising it all into Trello, only to find out, it was likely what I already knew anyway and despite the feeling like i was missing something or needed something extra, that wasn't the case.
However, it does help me process, massively, mentally, although it might not increase my productivity as much as I feel like it should, it does help me make sense of everything and the world and therefore able to actually go do things without feeling so confused or if i'm doing the wrong thing all the time etc which allows higher productivity as a by-product.