Some lenses, such as the 17-55 f2.8, also have vents near the base of the filter threads. Using a filter on these lenses can help reduce dust ingestion. which begs the question, "why put vents where filters can defeat them?"
For what it's worth, on my 17-55 I don't feel any additional resistance with the filter in place. This lens does have a bit of resistance between 28 and 35 mm range when zooming, but I don't think its vacuum related. This is one of those things that feels huge when playing with the lens, but you forget about it when using it and you're more focused (no pun intended) on getting the shot.