Are you saying that you basically do bulk style lifting (heavy weight/average reps) on the big muscles, like legs/chest?
Yeah I've never had really good results at all with the whole low weight/many reps type of lifting. I do those sometimes, but only periodically for a week or two at a time to give myself a break switch it up. Or might throw them in as an aside if I have time.
My reckoning is this. If I want to build muscle/get stronger, then I lift heavier weights on compound movements like squats, bench, etc. If I want to look more "toned" then I need to eat better and do more cardio (both of which I hate btw, which is why I don't look toned, lol).
But I've had better weight loss success (long term) in sticking with the strength-focused routine versus a more cardio/lighter weight one. When you grow muscle you are improving your metabolic rate, making you more prone to burn calories during any activity or none-activity 24/7.
With those compound movements, I say that you get more bang for your buck than isolation lifts like curls or leg extensions, because you are using more muscles and effort, thus recruiting more muscle fibers and actually burning more calories during the session as well. Lifts like squats, when done with free weights, also work your core and are beneficial across so many sports it's not even funny. Having said that, I haven't been able to squat with heavy weight for 6 months due to this fucking groin injury.
I'm sure that I'm wrong with some of this and someone with more knowledge can call me out on it, but for me I've tried everything over the years and this is what I've had the most success with. My thing is that I have maybe 40 minutes of actual workout time 4 times a week right now, so I have to maximize that time. Everyone is different.