Hair treatment effects

I see treatment commercials where they apply the conditioner after shampooing, wait about 5 minutes, and then rinse it off. Does that actually work? I often forget to use it, and waiting 5 minutes after shampooing is a hassle, so I end up skipping it more often than not. For those of you who do use conditioner, is there a big difference between when you do and when you don't?

I'm not expecting the same results as getting it done at a salon, but I was wondering if it's still better than just using shampoo and conditioner.