I don't really like drop sets myself, I have found the best way to increase intensity is with rest-pause sets. This way you are sticking with heavy weight, and are only hitting fast twitch fibers.
I normally use a weight which will allow me to fail at 7 reps or so, then rest for 5-10 secs, and power up 1-3 more reps. Unless your doing shoulders, or biceps I feel that drop sets give you a "soft" "stringy" look rather than the dense, vascular look that is achieved by rest-pause sets. Try them.......stay heavy, go hard, leave sore!