Actually, no. A recent poll showed that most Americans really aren't interested in the royal wedding. Naturally our media are hyping the event, as media do when something like this comes along, but they aren't making any bigger a deal of it than the British media are. I read British news sites every day; believe me, there are constant stories and comments from British readers on the subject of the wedding. The Daily Mail publishes loony speculative wedding stories regularly, and they get hundreds of responses from Brits debating such minutiae as the color of the jacket that Middleton wore on a recent outing.
I might point out that despite the existence of the Internet, the level of publicity on both sides of the pond seems to me to be somewhat lower than that generated by the wedding of Charles and Diana 30 years ago. The hype back then was astounding, unfortunately so, since it bathed a relationship between two unsuited people who barely knew other in a romantic, fairytale glow that raised expectations for their marriage in a very unrealistic manner. It might not seem like it to you, but this time around, coverage really is much lower-key in tone and extent.
Edit: Ichiban, British taxpayers WILL be funding the public services needed in connection with the event -- extra police and other security personnel, street cleaning, overtime for public employees, possibly extra public transportation, etc. I've no idea how much all that will cost, but the royals and the Middletons won't be paying for it.