I find that developing film is costing more each day. Blazing through a roll in high speed mode is fun but expensive. My fastest film camera is a Nikon F100. I take advantage of the AF and its reliability being a newer camera. I use it in aperture priority mode; same as I do with my F3HP.
On the other end of the spectrum, if I am going to take my time to shoot in full manual mode (like with my F or F2A), I feel it will be a better idea to shoot with one of my Mamiya 645's or RB67. My logic is that I will get a much better image with 120 film over 35mm film, so If I am going to shoot fully manual why not get the best possible results?