Ahhh, IOA has shown once again that they are ahead of the game. Single rider lines for Dr. Doom, MIB and Hulk have saved me lots of time, and I applaud the effort. While strictly opposed to Fastpass/Fastlane-type virtual queueing systems, I favor single-rider lines.
Generally speaking, those guests using these lines are more knowledgeable, and don't take extra time getting into their assigned row, getting into their seats, buckling up, etc. Therefore, there is little or no reduction of the overall capacity of the ride - and the trains look much nicer running FULL of guests. I have to admit I sometimes get a little annoyed seeing bunches of empty seats on trains while waiting up to (or even over) an hour for a ride. At SFA, there is a row on every train reserved for Fastpass, and 90+% of the time, that row runs empty. Looks terrible, increases the wait for everyone...Single riders ROCK! Only exception is on rides like T-Bolt at Kennywood where two riders are required.
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rollergator - intent on improving the "guest experience" - coming soon to a park near you