As someone that has been in the gym regularly for the past 20 years as a bodybuilder, trainer, owner and also an observer it truly surprises me how few trainees take advantage of the many varied angles, grips and planes of motion in which we can target our muscles.
One of the quickest routes to stagnation when it comes to hypertrophy is to continually to do the same things over and over again. This may not occur in the very beginning, but after you have been at it for a few years believe me when I tell you that your muscles and nervous system will become quite resilient at not responding to the exercises you expose them to.
So, does this mean you have to constantly switch movements at every workout in order to continue to make progress? Not necessarily! By simply changing your grip, torso angle, and/or plane of motion you can use the same basic exercises while actually altering motor unit recruitment patterns entirely. So, in a sense, to both your muscles and CNS, it will seem like you are doing a totally different movement, and thus the stimulus they receive will then be unique (and more productive).