Calculating Expectation While Multi-Tabling

[Rookcifer]

In NLHE:TAP, the authors discuss expectation while playing the nuts on river, or value betting when you are X% sure you have the best hand and are Y% sure of the times he will call with worse hands.

If you have the nuts, then the following is all you need:

EV = (Pcall)(S)

where

P = percentage of time he calls
S = size of bet

However, value betting is a bit more complex because you must calculate the percentage of time he will call X bet with Y hand, and then calculate the percentage of times you lose the showdown.

Like the authors discuss on page 87, if you think there is a 20% chance he may have you beat, and you are contemplating 3 bet sizes -- one of which he will call 100%, one which he calls 50%, and one he calls 30% -- then the math is much more complex to do on a whim (not to mention determining what percentage of each bet size he calls -- this is tricky in itself).

Again from page 87:

If $200 is the smallest of the three bet sizes and he will call it 100%, but beat you 20%, the EV equation is:

$80 = (.60)($200) + (.20)(-$200)

I don't mean to regurgitate a book most of you have read, but here's my question: Does anyone here actually sit at a session thinking like this and then doing these calculations in one's head? When I am 8 tabling I just don't have time to do these calculations (and I think few people besides Kim Peek actually would do all of these calculations in a few seconds). Do these calculations sort of translate into a "feel" the more one plays? Does it become intuitive (even though one's intuition may not have razor precision). I am a pretty smart dude, and I suppose I could do the calculations but it seems tedious when multi-tabling.

BTW, the book is great, as I am sure anyone who can master all the techniques will have as close to a perfect theoretical understanding of what moves to make in any given NLHE situation that is possible. I think the book shows there is no "gimmick" techniques one can use to become a great player, it takes a lot of work and theoretical understanding. The authors are right, I don't think there are any cookie cutter plays one can "memorize."