Well, some people use a laptop as a plain laptop, others use it as a desktop replacement and need a little more connectivity. When I use my PC laptop on the loose I usually only need two USB ports (one for the nano-receiver for my Logitech mouse, the other for charging and synchronizing my iPhone). But when I use it in my studio I have it in a combined docking station/laptop stand, and, well... there's a LOT of stuff plugged in here:
Belkin 7-port USB hub
Logitech USB speakers
Receiver for Logitech DiNovo Edge keyboard
Receiver for Logitech MX Revolution mouse
iPhone dock
Universal Dock (for iPod Classic)
Canon scanner
USB hard drive for backups
Digital camera dock
Card reader (bank stuff...)
Korg MIDI controller keyboard
Copy protection dongle for Cubase
Additional empty USB port for occasional use of USB memory stick
That's 13 USB ports used, 7 on the hub, 4 on the docking station and 2 on the laptop. Then there's a 24" monitor (DVI), Gigabit Ethernet and a firewire audio card/mixer.
Here's how I plug all this stuff in: Put the laptop on the stand and press until I hear a click.
I've been thinking about replacing this machine with an MBP 17" and getting a Rain Design stand, but my biggest gripe (since Apple are too cool for docking stations) would be plugging and unplugging all the cables, even with two external USB hubs there'd be like 5 or 6 cables to mess with every time I move the machine.
Obviously if you use a notebook as a desktop then you have issues and need hubs. Having a wireless router that can connect a printer through USB or if the printer has ethernet that saves on the whole USB printing issue and backups.
I also think it is safe to say that most users don't have as many things going on as you and no amount of notebook USB ports would help. Though the beauty of something like bluetooth is the ability to use wireless peripherals without using any ports. Unfortunately, the Apple Cinema Display is very expensive and provides a lot of capabilities of a hub without all the extra wires. It is designed to use with the Apple notebooks in this way.
If you use something with IR that requires a port, then that can be a problem. Though usually if someone is really on the go they use the trackpad and keyboard. I actually prefer the Aluminum MB trackpad to most mice. Multi touch is an often overlooked perk of the Aluminum version vs. the White version. It's nice to never have to click anything and the various maneuvers.
Now when you aren't on the go it is nice to have a multi-function printer with a card reader that you can hook up to the USB and also contains a card reader to transfer photos. If you are on the go then there are many cameras that have wireless SD card capabilities. There are also printers that do all wireless which is also a nice thing.