Disclaimer: This is my opinion, please do not give me little red dots for expressing it, controversial though it may be.
Background on me, as context: I'm fairly new to FIRST; I joined last year as a senior in high school, caught FIRST Fever, and came back to mentor my team as a college mentor.* I admit I've spent more time in the stands than in the pits at competitions (usually less "in" the stands than in front of them, where an area is usually set up for people to dance**), but I have spent my share of time in the pits, whether talking about the robot as a "pit ambassador" last year or just wandering around collecting buttons when I wasn't needed elsewhere.
What I've seen, as regards the shouting of "Robot": I haven't seen it being a problem. I've never witnessed teams caterwauling at the top of their lungs; instead, I saw teams approach a congestion point and say "robot" at a volume just above a normal speaking voice, at which point those blocking the aisle would acknowledge with an echo of "robot" and clear it. No muss, no fuss. It is possible there were teams at the events I attended who did engage in the more objectionable behavior and I was elsewhere or simply didn't notice.*** Yes, I can see how those that do constantly scream "ROBOT" can quickly get annoying, and I do agree that unnecessary noise in the pits can cause safety issues, as can people crowding out of their pits and into the aisles. However, I'm not sure arguing about it on Chief Delphi is going to do much to resolve the issue.**** This thread has turned nearly as acrimonious as the ones on student-built versus mentor-built robots, and has done about as much to resolve the issue as those do. Thank you, sanddrag, for bringing the issue to our collective attention, but fourteen pages of debate is a bit much, no?
Again, this is my opinion. If you disagree with my opinion, please PM me rather than giving me negative rep. Thank you!
*Yes, I know this is not strictly recommended, I just couldn't stay away. 
**The Pacific Northwest regionals tend to have lots of people dancing, though I understand that isn't necessarily the case elsewhere.
***Yes, I really am capable of not noticing someone screaming "robot" six inches from my ear. Huzzah for Asperger's Syndrome. 
****Yes, I know some of the higher-ups in FIRST read Chief Delphi. My point still stands, because the root of the problem does not lie with them.