Yeah, it's kind of an unfair setup in the SEC. Currently, each SEC team plays all five teams in their division every year on a home-and-home basis, two rotating opponents from the opposite division in a two-year series on a home-and-home, and one lock from the opposite division on a home-and-home.
The Big XII operates the same way, with division opponents playing a round robin, which I'm in favor of. But their inter-divisional games are different and more simple. Each school plays three teams from the opposite division for two straight seasons on a home-and-home basis. Then for the second half of the four year cycle, each school plays the three other teams on a two-season home-and-home series. Everyone plays everyone fairly, and there are no four-year gaps between playing a conference opponent like there are in the SEC, just two-year gaps.
I think the SEC did that to preserve the Alabama/Tennessee game, a traditional rivalry. Crazy.