Keep in mind that Protein Drinks are regarded as a "SUPPLEMENT" and as such and when used properly can be very beneficial in a well structured nutritional program. I agree with the crazyoldman in that you should eat good quality foods, where and when ever possible. Unfortunately eating this way 100% of the time is impossible for 99.9% of the population. Nutritional Planning, purchasing, preparing, consuming and cleaning up after food takes time and energy. e.g.You have to work late and get home after a long day tired and felling ****ty, the spouse is screaming the kids are puking up their guts, the last thing you want or are able to do is think about your macros and what your going to have for dinner. A good quality whey isolate leucine enriched protein powder with some mixed berries and peanut butter thrown in the blender for 20 seconds is an easy way to hold yourself over for a couple of hours until you get the chance to eat properly.
One should never use protein powder in excess or as any easy out or excuse to not eat properly, there is however a strong case for supplemental use of protein powder in most peoples nutritional programs.
I personally take an 8oz glass of full cream milk with protein powder (27g P, 1g C, 0g F, totals for protein powder only) before bed pretty much every night. I love it and it signals the end of the day, sleep rest and grow time.
If your nutritional program is good then don't change it, "tweek" it to reflect your new goals of muscle hypertrophy. I'm sure you know that you will not be able to gain muscle without increasing the amount of calories your consuming each day and increasing the amount of protein your supplying for recovery and repair. In this instance a good quality protein supplement might be beneficial.