Betting line vs no betting line at casinos, why?

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Why do some of the poker rooms have the betting line and some not?

I never played in Vegas before and got burned by the no betting line.

Was used to playing with a betting line but then went to the Wynn and this hand came up...

1/3 NL game, $200 pot, I was 1st to act on the river.

So I had a bunch of little stacks of $3 chips and I simply want to count them out so right in front of me I start making little piles of chips as I was thinking how much to bet.

As I was making these piles the other guy in the hand says "Ohh, that is a string bet"

And the dealer agreed with him so he just called a $9 bet into the $200 stack. But the thing is, I did this same thing for 2 hrs before that hand and no one said anything.

It would be easier for me to know where I can count my chips and where I can't if there was a betting line.

They told me the rule was that if I put any chips in front of my cards, then that is the bet...

But I think a betting line would lead to less confusion.