Just so you know, Creidem, I have the same problem. I'm 34, a 19-year gym veteran and a former ball player. At 6'4" and 280lbs, my waist is 38". I've recently become the executive director of my agency and it requires a better wardrobe, better presentation, and a better overall and long-term fitness. So I've recently started a new regimen to come back down to around 260 and a 36" waist.
But, my legs are huge. And regardless the workout, they grow. Tailored pants are part of the answer. I have several pair, but even so, less leg girth would be more comfortable.
There are several things I have to do to keep my legs in check. The first is to obviously not work them; or at least not as directly. Right now I do a basic circuit: upper body, lower body, upper body, lower body. However, for the lower body I do deadlifts, partial deadlifts, and cleans; keeping the reps around 10. I sometimes do a partial leg sled movement. I keep the movements explosive on these exercises. I'd also do hyper-extensions if my gym had the necessary equipment. I never (or very, very rarely) do squats, lunges, extensions, or hamstring curls.
Next, where I would usually spend time on legs or a leg day, I go to the track (in my gym) and do 15-20 minutes of sprinting and walking. Or I play a good 30 minutes of basketball.
For cardio, I've been going down to the spin class once or twice a week.
If you're taller than maybe 6'2", the mechanics of many of these exercises are different (there is an old thread around here to that effect, "why won't lurch grow", maybe?). So I think that might be why bringing your legs into order and symmetry can be a little trickier. I know it is for me.
That's my two cents for now...