I feel I should also give some credit to my newest lens, the Canon EF 70-200mm f/2.8L IS II USM. I finally took the plunge and bought the beast!
Judging by my latest experiences working with Canon's "L" lens, I do have to say a good lens does make you a better photographer. I think it is one of the rare cases in life where purchasing more expensive, high end equipment does make a huge difference in one's work. I can't say the same for purchesing luxurious guitars in the past. If one is not musical, there simply is no hope.