Yes, I am sure it has. As one of the new switchers, I wonder how the longtime "Apple faithful" must regard us. I am sure that we are a mixed blessing.
Yes, it is great to see the renewed interest in Apple computers, and the increasing numbers of new users. It nice to see the acknowledgement that you have been right all along.
However, if the numbers get large enough, the exclusiveness of the "Mac club" will be watered down, and of course, the more people there are on Macs the more targets there are to incent hackers and virus writers to attempt to break down Mac OS X's vaunted defenses.
Personally, and selfishly, I feel that I have joined an exclusive society in joining the family of Mac users and I am in no rush to see the rest of the world follow suit. Let the "great unwashed" stay out there with their PCs and their virus' and their 20 security updates a week. I am lovin it here in Mac-land!