I like the drops on our Redster (Red Co-Motion Speedster) because of the wide variety of positions that it affords me. Greatly reduces hand/butt fatigue because I can change riding positions as it suits me. When we're speeding by the A riders on downhills, both stoker and I go into the drops to reduce wind resistance. Other than that, it's only a position convenience.
Cheers!
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2008 Red Co-Motion Speedster Co-pilot (Redster)
2009 Surly LHT (captain's commuter)
2009 Surly Crosscheck (stoker's road bike)
2007 Giant FCR2W (stoker's commuter)
1980's NOS Legnano (stoker's toy)
1970's Stella rebuilt as fixed-gear (captain's toy)