Multitasking is just rapid attention change, and it can be jarring going from rapid changes in focus to lower stimulation and longer term focus, but both frames of mind are valuable, situationally. You might get more value multitasking but you might also bring a lot more value to some meetings by staying deeply focused, and I think that highly focused, high participation meetings are the ideal. Other communication can happen other ways. To help me with long & deep focus, I've found that reading novels or other long form writing helps me tame the impulse to bounce around so much, somewhat.