I'm not sure what you want everyone to do about it. I went to a O's weekend game against the Red Sox at the end of May and it was just about the most miserable game experience of my life. The crowd was probably 85% Boston fans. I'm not usually someone that cheers every time they make noise and I'm certainly not going to go ahead and lose my voice trying to make up for the 5 to 1 fan differential.
Your 2nd idea.. Cheer incredibly loud for routine plays. Whats the point? I understand those idiots do it but it pisses me off and I'd feel stupid doing it. Boston fans were cheering for Youkilis when he caught a pop-up. They probably cheer him when he wipes his ass in the morning. Again, I'm there to watch a baseball game, not to see whose fans can cheer louder at plays a little leaguer can make.
Until we become more competitive, I think a lot of O's fans will stay away when these bandwagoners come to town. It's just not very enjoyable to be surrounded by obnoxious idiots who feel the need to talk trash and loudmouth O's fans in their own park. And seeing as they have a very good team and our team is average, there's little we can do about it to shut them up. You can only tell them to go home and watch Fever Pitch so many times. After awhile, your team on the field needs to help you out. Having said that, I plan on going Wednesday. Hopefully we blow them out.