Actually the one i use the most i almost forgot about, cause i do it so often i don't even think about it anymore. I use Space bar for a camera save, and it always has where my hatches rally too. very helpful for reinforcements.
Though to answer your original question, i don't actually know of any pros that use camera saves, for certain. Also i will say that my hotkey set up is very unorthodox and i all my camera saves were placed much closer than F5 - F8 + shifts.