For most of the trips I have made (excluding Leeming!) the times door to door worked out about the same driving or flying, allowing 30 minutes to get to the airfield, 30 minutes there before starting up, and time for a taxi at the other end. So I could make the decision on the day, just before leaving home, on the basis of the latest weather.
Like that, you shouldn't succumb to pressonitis - though you might suffer from get-home-itis instead, at the end of the day, if the forecast was wrong. I have the luxuries of an IMC rating and a ILS-equipped home base, though, which make this much easier.
Tim