I have never rotated carry guns, in the manner to which this is addressed, just because I have always wanted to stay proficient with the gun I had to carry, and for most of my life "had to" applied.
I started out with a 4" .357mag revolver, carried the same gun off-duty in 2 3/4" flavor. hwne we went to 9mms the 3rd gen S&Ws were chosen.
Since the 5906 was the duty weapon, I bought a 6906 for off-duty and BUG. It wasn't my choice, but since that was what I was stuck with I thought it best to get good with what I was going to carry and make the most of things.
Now that we carry Glock 17s ant work, I also have a G19 for off-duty, and a G26 that used to be my BUG.
I am now carrying S&W J frames as my BUGs, on and off duty, due to concealment issues, and due to arthritis in my knee no longer allowing me to carry the G26 as an ankle gun.
In staying with the "shoot what you carry" theme I have sold off all my other serious handguns and now only use Glock 9mms and S&W J frames for carry (although I have a few other sporting guns like large frame .357mags).
I find for some reason I have no issues at all going back and forth from the Glocks to the J frames, but if I throw in going from the Glocks to something like my old HK USP .45 then I was all jacked up when trying to manipulate the gun at speed.