Your absolutely right about that!!Also, I find the greater the "gear difference" (i.e. I am in 5th or 6th and it needs to drop to 1st or 2nd) and you are now booting (or partially booting it) ... the tranny can take a little time to figure this out. This is why I often limit my transmission to go no higher than 3rd or 4th in the City.
However, when I purposely "boot it" a couple of times, the tranny does start to figure out which gear it needs to be in quicker.
I find the "delay" is at it's worse when I have been taking it easy for awhile (few days or more) and then need to boot it.
It seems the best thing to do, is "Beat the truck on a regular basis ... preferably a couple of times a day". Let it know "Who's boss".
2012 screw 3.5L