In my travels.. MOST still charge for internet. Free internet is considered a 'perk'.
And as Phonedave mentioned, some just roll the fee into a 'resort fee' type scenario (which the Gaylord does right across the street from WDW) - which you don't get to opt out of.
The chains trying to LURE customers in are the ones offering free internet. However, it alone isn't always enough.
When on travel - which is more cost effective? To stay at a hotel that has free internet, but I must taxi or rent a car to get where I'm going every day... or stay at the hotel of the event where I pay $12-$19 dollars a day for internet. The choice is easy...
I will say as someone who doesn't travel nearly as much as I used to, but still travels at least one week a month... I still have to pay more often then not.
That said though.. the Hilton I was just in last week had free internet.