Rollei's are quick, the auto-sensing ones mean that you don't need to line up arrows, just get the tab onto the take-up spool and go.
With practice you can reload a Hasselblad quickly, but they are a bit fiddley compared to many. One thing that helps a little if you aren't immediatly re-loading a Hasselblad is to switch the spools when you take the film out, that way the back is always ready for loading. (actually this is true for pretty much any roll film camera).