It's not an infectious disease. People don't get a case of the "Windowers". People choose to use it because they see the benefit in it. If people laugh at you for not using Windower those are the same people who'd laugh at you for any reason they can think of. It's a problem with the people, not with Windower.
Windower is not a problem, FFXI is the problem. Windower is one solution. Many people, including me, would prefer if the FFXI people got off their asses and improved FFXI to a point where Windower wasn't necessary, where FFXI would become its own solution. But I'm starting to think that time may never come.
You saying Windower is a problem because the people not using it are being left out of the goodies is like saying telephones are a problem because there's crazy people who choose not to use them and they're unable to communicate as well. Because that's what Windower essentially is: progress.