I agree that the 5x5 is a great way to get people on the road to understanding how to make progress.....it isn't the be all and end all.....but the theory behind it is.....add weight to the bar, get strong, get big. Drop sets and down sets and triple bomb blast sets will be the last thing on your mind once you focus on progressively increasing weight on selected main movements. The program teaches you to think for yourself and to evaluate a program for yourself. If you don't like 5x5, do 3x8 or 4x12 or 3x10 or 3x3, whatever, just be consistent and gradually up the weight, focus on big lifts and realize what a "foo foo" exercise is and why, although you get a 'pump' from them, they are an utter waste of time.
About gear, I ran 5x5 programs with gear in the past. You can push that much harder, gain that much faster, and recover that much quicker. You can ram up the workload more, you can add extras, and excessive soreness to the point of screwing up the routine is a non-issue. It is an enhancement, nothing more, nothing less. Instead of mon-wed-fri.....I'd train mon-tues-wed-fri-sat.....sat was for rowing, tricep and bicep work and calves.....tues was for snathes.....I'd flat bp on mon, ohp on tues, incline on wed, and do close grips and flat bp to 90% on fri.....if i did that now i'd over reach in week 1, lol....but with a little test and deca, my shoulder girdle thrived.....I'd back squat heavy mon, do oh squat tues, front sq and gms on wed, and back sq to 90% on fri.....again, I modified it, since my recovery abilities were that much greater, I could do more work in a week and thrive, thus progress faster......gear is gear, it certainly won't hurt your training, lol.
This was in college and I'd typically run 10 weeks of Testosterone Cypionate or Enanthate (400mg/week) and Deca-Durabolin (400mg/week).......The long lasting esters of test and the nandrolone allowed me to still 'feel it' for several weeks after my last shots, so I had flexibility with my deloading, I usually loaded 5 weeks, deloaded 1, loaded 4 weeks, deloaded 1, then came in after the last deload to try to PR on either singles or reps to failure.....then just trained light and low-workload for a good 5 or 6 weeks until my body was back to 'normal'.
I am not advising anyone to do this, lol....it is just a tale of my own experiences.....I did 4 of these cycles in my life, it was in the late-90's and the gear was human-grade, potent, and did what it was supposed to.....not like the crap guys use now, underground and under-dosed.....a gram a week of vet or mexican test for 4 weeks and still waiting for it to 'kick in', lol, I'd day you got ripped off....anyway, I am rambling and I'll stop now.