I have a lifetime Delta Sky Club membership, so I can get in when flying any airline. So I have taken the trek from the old Delta Sky club in terminal 2 to the G gates for Alaska flights. Its really not that bad. 10mins walk. Is it the worst thing to have a nice brisk walk before you get on a 2-3 hour flight? I think at one time, not long ago, AS gates where in the L gates, which was even further, trek from terminal 2.
Also the precheck line has always been easy peezy at terminal 2. And not sure if still like this, but terminal 3 didn't have Clear. only terminal 2, and maybe terminal 1 also?