After being diagnosed with ulcerative colitis last December, Saturday's clash marked the 28-year-old's first Premier League start since November 2011 and the Scot netted Manchester United's second goal which helped fire Sir Alex Ferguson's men to the top of the Premier League.
"It was great [scoring a goal] but the most important thing is the win," Fletcher told Sky Sports.
"Scoring a goal on my first Premier League game back was a nice moment. It's another nice moment. Just playing the games are great moments, as are all the games this season.
"I'm desperate to be a part of it, so all the games I can do I want to be back involved in and feel that I can contribute to what will hopefully be a successful season."
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With Harry Redknapp watching his new side in the stands, QPR took the lead in the second half through Jamie Mackie. Jonny Evans equalised in the 64th minute for United, before Fletcher and Chicharito completed the comeback victory.
Fletcher admits United must prevent themselves from falling behind in games but believes his team-mates responded in the right manner following Mackie's opener.
"It is [becoming a habit] yes, and the only positive you can take from it is that we keep coming back," Fletcher added.
"We can't allow it to happen but as soon as we did go a goal down we lifted the urgency in our game but it shouldn't take us going a goal down to do that. Credit to QPR thought, they made it very difficult."