Bison REALLY isn't that difficult to deal with to be honest.
Every single time you see him dash, press a medium button. As FANG, I press cr.mk. As Birdie, I press either st.mp or st.lk.
Both his grab and his HK have startup so unless your reactions are completely shot or the connection is a laggy mess, there are ways to get a button or a move out beforehand to counter anything he might try to do. And you might even get a Counter hit off of it.
Once your entirely focused on countering the dash, you start to realize that Bison doesn't really have that many good ways of getting in. He can capitalize on a mistake sure, but it's pretty damn difficult for Bison to break through a solid defense.
EDIT: and really, don't press buttons after his st.hk or df.hp. St.hk is +3 oB, and df.hp is +1 oB. Respect this man's normals.
See, I know all that, but I still have trouble reacting to the dash. I probably need to just anticipate it more.