It is possible to make a good lobster roll outside of new england. The local church here buys the pre-shelled claw and knuckle meat and assembles it into a lobster roll... they are not steaming and cracking and cleaning fresh lobsters to do hundreds of lobster rolls a week in the summer and are rated the best in the area. These big bags of pre-picked meat are available far and wide (they may even come frozen). It is still a delicious lobster roll due to the mayo to meat ratio and lack of other filler like celery. Lobster, a tiny bit of mayo, some salt and white pepper and then completely overstuffed onto a new england hot dog roll (griddled with butter or not) is all you need and you can do that anywhere. Around here there is that kind of a lobster roll and then there is also the "hot buttered" lobster roll which is just cold chunks of lobster on a griddled roll with warm melted butter poured over it.
What is at CHH is a high mayo, high filler version of a lobster roll. A good lobster roll is not cheap - even here where lobster is plentiful it will run you from close to $20 to $25+ for a meal with fries etc at a restaurant. Here is a picture of a $20 VFW lobster roll that I got at the street fair, mayo based:
and here is a pic I found of CHH's lobster roll... lots of mayo, lots of "other than lobster" stuff in it:
http://www.****************/wp-content/uploads/2013/02/Columbia-Harbour-House-Lobster-Roll-Disney-Dining.jpg
If you like "protein salads" with very very heavy mayo then you'll probably like it... but that's why people who have them in New England don't.
The BW bakery used to have one that was well reviewed and it looked like this:
not super overstuffed and I don't like lettuce on my lobster roll (it's a way of filling out the bun with something other than lobster) but the right mayo to lobster ratio and no other filler mixed into it. It's too bad this was gone but I bet it would taste decent even if not very generous on the lobster portion. It is definitely possible to make a good lobster roll outside of new england but it will cost big $$ to do it. I doubt you will see it at disney at any place where you can get it for a QS credit, that's for sure.