B Fold--
You have a point, but I do have to go with what works for me. Leg presses have built pretty noticeably large thighs, and I think this disproves that idea that you need squats to build leg mass.
However, I agree with you that you are your weakest link (good bye!). If I start squatting, I might see more improvement in my symmetry -- calves, abs, lower back, outer thighs, and maybe even shoulders. It's also tough for me to get separation in my thighs, even though I have no problem with that in my upper body. I don't want to give up my 18 plates (and that's low reps, not high), but I might start doing both movements in my leg workouts. I'd start out with Smith machine squats only, so I can perfect my form, and so that I can take my sets to failure.
Always trying to improve.........