In any event, I usually order pizza online, and it takes a couple of clicks. Even on the phone it's less than a minute.
Do you really consider your time so important that you refuse to even spend one minute on the phone talking to another human being to order a pizza?
But I could see a huge value in having someone make these decisions for you when it's something that's far outside of your normal routine. The last time I went skiing for example, we landed in the small ski town at night and needed to get dinner, we ended up calling around to 4 different places and making a bunch of arbitrary decisions and still had no idea if the food would even be good. Someone else (or eventually software) could have done that just as effectively and it would have saved us a lot of stress, in that scenario it really would feel like magic.
FWIW it's more like 5-10 minutes every time I've ever ordered pizza (admittedly not often, I'm sure my pizza skills could improve, if I worked on them. I don't want to.)
Magic doesn't magically know your address/payment, of course, but it remembers it in the future. For every service, including new ones. I'm sure you actually knew that already. Point is it's one-time, ever.
Granted, Magic has that for all transactions, but pizza can already be pretty convenient.
1) You're not at home. 2) You don't always order Dominos. 3) You don't even know what's available for delivery (I'm in a less urban area than most--Pizza Hut just started delivering in the last 12 months, and doesn't deliver to the whole city)
Essentially, when things get complex, Magic's cognitive load hardly changes at all. If it's a matter of routine (same pizza, same company, same house), your way is probably worth saving the money they charge.
Anyway, my pizza place has none of that. Including "online account," my pizza guy would have a good laugh at that.