I've been using Geany for longer than I'd like to admit. It certainly isn't the worst editor I've used. I'm yet to find something I can straightforwardly switch over to without too much re-thinking. This being said, there are a few, er, *design decisions* that occasionally hit my usability thresholds and momentarily prompt serious (re)consideration of what else is out there. For now, nothing else meets my criteria, so I thought I'd complain about Geany bit. :P
One of the big issues I face is the "way too many open tabs" problem. Chrome "solves" this by simply falling apart at the seams if there are too many tabs in a window. Definitely a hacky approach to UX design; it prompts users to discover the wonder of *m̩͈̊͂u̩̟̾́l͈͇̀̒t͍̞̎́ḭ̥̊͘p̞͔͐̄ḻ̛̜͌ě͔͔͘ ͉̜̔̃ẁ̖͖͛í͉̦̀n̜̯͐͒ḑ̳̆͌o̳͆̅ͅŵ̟͖̾s̖͕̒̾ of too many tabs ę̷̳̝̙̰̯̞̮͇͈͍̝̪͉a̶̡̧̝͙̹͉̲̮͉̖͎̜̹̠̫͜c̷̨̢̢͖͍͍͓̺̫͙̪͎̱ͅh̴̢̢̨̨̤͓̝̙̞̙̦̩͍̣̘̻*, which ~~*d̛͙͉̹̤̳͊̃̒̕e͇̹̗̟͙̎̇́̓͑ȅ͔̯̖̺͚̒̆̾͆p̦̤͚̜̀̈́̓̂̕͜ë̢͉͔̙͈̃̿̕͝ň̟̤̥͚̦͋̂͗̍s͍̜͈͚̫̐̉̅̓͠ ̲̗̫̖͔͗̀͂̍͌t̡̪̹̹̤̾͑͌͌̐h͙̺̥͍͕͑̇̄͒̽ē̼̦̰͉̖̑͑̄̑ ̨̼̬̩̏̎̔̌͝ͅr̹̣̻͔͛̂̓̍́͜ą̛͚͈̙̦̓̉̀̕b̧̠̦̹̈́̃̏͌̔ͅb̩̱͓̤͑̑̎́̇ͅi͖͓̫͍͈̅̉̂̽̓t̼̺̤̞̜̃̑͆̍̎h̤̠̲̥̦͑̅̃̐́ő̲̦̘̗͎̑̋̋͝l̲̦̞̘̮̐̔̂̄̈́e̟̲͎͉̳̐̆́̊͘*~~ temporarily mitigates things somewhat.
Geany provides no such opportunity; I'm stuck lumping files I occasionally edit every six months but don't want to forget about into the same spot as code I'm currently working on. (Project files too are heavily self-specifying/opinionated for me to apply them as a generic solution to this problem.) Being reminded of old things and "ah, that old tab, no don't accidentally cl--agh, go and reopen it" tends to be very flow-breaking.
I'm currently trying to work around this issue by opening multiple instances, but that introduces problems of its own (see #1834). Besides the implementation bugs, the biggest gripe is the clunkiness of the UI.
**It would be *awesome* if I could drag tabs between instances.**
It would certainly be possible to use drag-n-drop and X11 IPC to do a complex dance to "move" files between instances. But that would be a *ton* of work for one comparatively tiny feature.