Disclaimer: not exactly a Northeasterners. Like "not at all".
Standing in line is the most common usage, yet "on line" has been used for some time now.
(This blog post comments:
Many commenters have pointed out that this seems to come up a lot in New York (and New England).
I was just watching 2001: A Space Odyssey by Stanely Kubrick and Arthur C. Clarke, released in 1968. I noticed “on line” being used and looked up and it turns out that Kubrick was born in New York.
So take of that what you will. This also is evidence that it is definitely not a new or recent phrase.
The debate raged on democraticunderground.com:
We say 'standing in line', as in 'in a line', eg. 'part of a line'.
Waiting FOR you' is waiting for another person to arrive or accomplish something.
Waiting ON you' happens in a restaurant.
I Stand On Line At The Bank... My Car Gets In Line At Jiffy Lube
So unless you have to walk over and stop on a line in order to wait for your turn, ... you probably are waiting, standing in line.