Driving time to Big XII opponents (from Lincoln, per Google Maps)
North - Average 4 hours-12 minutes
Kansas State - 2-33
Kansas - 3-20
Iowa State - 3-37
Missouri - 4-47
Colorado - 6-43
South - Average 11 hours-38 minutes
Oklahoma State - 6-07
Oklahoma - 6-47
Baylor - 10-19
Texas Tech - 11-02
Texas A&M - 11-39
Texas - 12-15
Driving time to B1G opponents
West - Average 7 hours-07 minutes
Iowa - 4-24
Minnesota - 6-14
Wisconsin - 7-07
Illinois - 7-41
Northwestern - 8-10
Purdue - 9-08
East - Average 16 hours-04 minutes
Indiana - 9-59
Michigan State - 10-28
Michigan - 10-46
Ohio State - 12-02
Penn State - 16-09
Maryland - 18-00
Rutgers - 18-58
I guess "not that big of a deal" is a pretty relative term but a 69% increase in driving distance within the division and a 38% increase to the other division is pretty significant.
In addition, in the Big XII there were four road games you could do as a day trip without too much trouble. There's only one of those now. So that makes quite a bit of difference.
Important to note, though:
Kansas State - Manhattan, KS (yawn)
Kansas - Lawrence, KS (yawn)
Iowa State - Ames, IA (yawn)
Missouri - Columbia, MO (yawn)
Colorado - Boulder, CO (beautiful town/environs)
Oklahoma State - Stillwater, OK (yawn)
Oklahoma - Norman, OK (yawn)
Baylor - Waco, TX (YIKES)
Texas Tech - Lubbock, TX (yawn)
Texas A&M - College Station, TX (yawn)
Texas - Austin, TX (great town, neat destination)
Also important to note:
Kansas State - easy win, boring game
Kansas - easy win, boring game
Iowa State - easy win, boring game
Missouri - probable win, OK game
Colorado - easy win, boring game
Oklahoma State - probable win, OK game
Oklahoma - great game, wonderful environment
Baylor - probable win, OK game
Texas Tech - probable win, OK game
Texas A&M - great game, wonderful environment
Texas - great game, wonderful environment
I know people really like to wax nostalgic about the Big XII, but the most likely outcome was a round trip that ate up most of two days, a boring win, and a hugely boring town. You're staying in a Motel 8 or a Radison, there's no decent food, there's no decent entertainment, there's no decent shopping (or, at least, none of it was better than you'd get in Lincoln/Omaha where 80% of the fans were coming from).