@greenWhale I usually only let my group ask one Gather Information question per player *before* a score, to limit excessive inquiring. Gathering further info is either done during the score or in a flashback.
Gathering Information before the score also isn't so much about planning but more about scene building. If one player asks "What kind of defenses are there?" and someone says "I'd love to do a score with ghosts!" then there'll be occult traps or something. That isn't necessarily bad.
Also, some players *enjoy* the planning part. BitD gives you an engagement roll and flashback mechanics so you can shorten the prep to a single "planning & load" question and then dive straight into the action. But that doesn't mean you *have* to use it.
In future games, consider giving your players some time to come up with the rough outline of a plan, and then when they start diving into minutiae and contingencies, just say "I think now it's time to roll engagement!" and go from there.
@hostilearchitecture I'll add the one question rule to my game, thanks.