Honestly, I don't know how a wired setup works, because I've always had wireless (probably because until recently, all that I've ever had were notebooks). And intend to keep it that way, because through those "N" based routers and adapters, you're more secure than ever. Wireless is more popular than ever, and many desktop users are converting by the day, and many of the newer desktops includes wireless as stock equipment, mine did.
It also makes your system more portable, being tied down by a modem and wiring limits moving your system to another room. I can completely move mine in less than 5 minutes. I would never want to be tied down like this, I prefer portability over a fixed installation anyday.
Cat