Ahhh, yes! "Factor 1" is exactly my dilemma! I can get back to that location on any weekend morning. However, will I ever see that exact combination of sun angle, sun direction (actually the sun was still below the horizon, but it still was a major factor in the shot), humidity and weather conditions again? Maybe or maybe not. I've not yet seen the same conditions I passed up on my way to work 8 months ago that I'm kicking myself over for not stopping to this day.
My proposed trip to the Maritimes may be another matter. It's a solid 1.5 days drive down there if I don't stop for photos along the way. Yet, that might mean missing some great opportunities. If I take a 2 week holiday, then that's not a big deal to stop along the way, but that means I can't go back in the summer, and later again in the autumn. If I do a 1 week trip, then if it takes 3 days to get there because I'm shooting along the way, then I only have 2 days down there (3 down, 3 back and 2 there = 2 weekends + 1 week). That might be hoping for a lot to get the weather, etc. I need/want while I'm there in that short of time. If I don't shoot on the way, I have a better chance (and I'm assuming here I'd only shoot fairly early in the morning and after I'm stopped for the night in the evening) of getting more stuff in Nova Scotia (apple blossom time) given I'd be shooting for 5 days instead of 2 at my destination. BUT, once again I might pass up a lot of good things on the way down and back, and come up with squat down there.
Maybe I should fly down so I won't know what I'm missing?... Hhhhhhhmmmmmmnnnnnnn
(maybe I should drop photography and take up a new hobby - like basket weaving - I hear they let you do that in "The Home" )