The best plans for success often follow the toughest arguments. We don't always recognize it, but a really good disagreement typically shows how far apart folks are thinking when the improvment process begins Once the work is done, the result that follows the argument must be good if everyone supports it because it has overcome the differences that caused the argument in the first place. Unless you are a "Yes" Man.
Don't apologize to people for having a difference of opinion. Use your differences to build something greater than any one of you could have done on your own!
When your team is looking to make things better, first be sure you share a common goal. If you have that, be sure team members are not copies of the same thoughts. Most of all, be sure you are not simply saying yes to the rest of the team, just to keep the peace. It is OK to be a "No" Man!