Love is allergic to garlic. Dried or powder form, no problem. The actual cloves or oils? Causes anaphylaxis. When we ate at Be Our Guest for example, the chef came out and talked to us and was able to make him a steak without the garlic butter and it was done separate from any pan which had the garlic butter. They put a little identifier on the plate and everything was handled very competently and efficiently. Yes, we had to wait 10 or 15 extra minutes to speak with the chef and detail the options, but it was well worth it for a meal that wouldn't potentially kill him.
Now, his is an abnormal allergy. So it's something we'll ALWAYS need to talk to the chef about. But for more common allergies, I think it's great to have some designated options front and center to help address the issue without extra steps. I think it's more considerate of the guest because it doesn't single them out or make them feel awkward for needing "special" treatment. A lot of people don't want to "make a fuss" or be put under scrutiny, so simply having clearly defined menu options which are prepared in an allergy-friendly way by default? Of course I think that's a good thing!