I'm not quite sure who you are talking about here?
1) Is it the person who was in front of you preventing you from breaking the speed limit? Well presumably you were travelling at about the same speed as him, and since you were overtaking the traffic to your left, presumably so was he. So, I'd say that as long as you were both travelling at 70MPH or less, then neither of you was in the wrong.
2) The vehicles to your left who were travelling so close together that you couldn't move left? Well if they were going slower than you, why did you want to slow down to their speed (from what you wrote you seem to be comfortable driving at high speed).
3) Maybe you were talking about yourself (no offence intended - there's nothing wrong with a self depricating attitude) for your dreams of wanting to go faster in unsuitable conditions. You are to be commended for keeping a safe distance from the car in front and for being patient enough to wait for a safe gap to move left into.
Patience is a virtue in congested motorways and there is usually very little to be gained (and much that can be lost) be speeding ahead until you meet the next car in front.
Everybody remember that it is not just your own skill that prevents you from having an accident, but the skill of those around you.