I think teams with huge name superstars get special treatment and, lastly, I absolutely believe people severely penalize teams for who their GM is regardless of the team.
I think teams with superstars win games.
2010 Conference Finals Teams: Boston (we know who plays for Boston, but KG is still one of the most recognizable people in the NBA), Orlando (Howard), LA (Kobe, Gasol), Phoenix (Nash, Stoudemire)
2009 Conference Finals Teams: Orlando (Howard), Cleveland (James), LA (Kobe), Denver (Melo, Billups)
2008 Conference Finals: Detroit (maybe the one non-superstar team), Boston, San An (Duncan), LA (Kobe)
2007 Conference Finals: San An (Duncan), Utah (Williams), Cleveland (James), Detroit
That's going back 4 years. You say teams with stars are getting preferential treatment, but Chris Paul, Deron Williams, Steve Nash, Carmelo Anthony, Chris Bosh, and Paul Pierce\Ray Allen (on the same team!) are all out of the playoffs. Where is their preferential treatment?
Now if you'd said "LeBron James, Dywane Wade, Kobe Bryant, and Dwight Howard all got preferential treatment", I would let it slide, because at least one of those 4 guys has been in the conference finals for the past 4 seasons. They should get preferential treatment, they've been leading teams deep into the playoffs for years.
As far as the GM thing, I think people can bear grudges, or try to strategically 'spike' ballots one way or the other, but those tactics are usually pretty transparent. Basically the same guys that have been low on your team from the end of the draft and through the pressers are going to be low on it come voting time.
For instance, Nick..you've been pretty down on my boys. I'd be interested to see where you ranked Chicago. I'm guessing.......4th? Maybe 5th on the outside?