Well my friend, even if you are a professional photographer, above all else, photography should be enjoyable, so, however you decide to take photos, slowly or fast, have fun with them.
I agree with you that taking a Polaroid-type shot slows you down a little but it is rather like shooting with MF or large format film; it makes you think more about the photo before you shoot as you don't want to waste the film or, more importantly, the moment. Do you remember Polaroid's 35mm film? They had 1 colour and 1 mono option and after the roll was finished, you had simply to place it in the processor, wind it through and out came the completed slides/negatives; I think it was the only time Polaroid allowed you to keep up with the action. Sadly, it only lasted for a few years but prior to digital, I loved the freedom it gave people.
I think you are a lucky man as you have your feet in both the analogue and digital worlds unlike most of today's youngsters; each has something special to offer and with that lovely 159 and 3 superb Zeiss lenses (that 21mm is outstanding and proves that Zeiss, Japan is every bit as good as Zeiss, Oberkochen!) as well as your great Canon cameras you have all the options to have fun for years to come... Just keep on enjoying...
All the best.