I switched from dual monitor to single monitors with a tiling window manager. Same reason, I "flip" context far less and am less distracted. Even though there can be multiple programs on my screen at once, they are all relevant to the current tasks context so I find if I do get distracted by one, it's not like getting distracted from the whole context.

Previously I would be "alt-tabbing" and constantly losing focus. Like stepping through a doorway and forgetting why you came into that room.