I squat 3-4 times per week (3 times a week if I stick to the strong lifts).
I have a pretty narrow list of exercise:
Cable rows/lat pull downs
For fun I will sometimes leg press or hammer strength bench press after I've done the barbell work:
I was pyramiding up to heavy (for me) doubles and singles.
Going to try to add in barbell rows, despite my misgivings.
For me I've never noticed much visible gain from isolation exercise, but if I add substantial weight to the big compound exercises I almost always look better.