My old notebook - a Tecra A8 - had a GigE ethernet connection. Many times when I wanted to move a few gig of data, I would skip the Wifi and connect directly to the ethernet. Linux never had a problem reaching high transfer speeds.
It finally came time to upgrade to a new laptop, and to my horror I discovered that many of the manufacturers aren't including GigE any more, because they seem to think Wireless N is enough. Under ideal conditions, I still have to wait a lot longer to transfer large files onto my new laptop than I did with my old.
My whole computing life I've been used to watching things get faster/smaller/cheaper, etc... this is probably the first time I've had to suffer a downgrade because of an upgrade.