I shoot a lot of small bore guns as I'm not a 12ga guy but I do have them and enjoy shooting them but not as much as a light 20.
It's hard to go from an 8lb 12 to a 5 1/2 lb 20 or 28 as they handle much differently. When I shoot clays if determine a point where I want to break the target, set my feet towards that point so I have plenty of room to swing and be aggressive. When shooting targets I don't like to go from a 12 to a 20 then back to a 12 and so on. If I'm going to shoot small bores then that's what I shoot that day.
It's just as hard to shoot a 12 when your used to shooting a lighter gun. There is a certain Fox 12 that I'm learning to shoot