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Recently, I tried out being a Person Of Size.
I flew
four segments on United this weekend, and presented boarding passes for two seats on each. (The cost of this was less than buying a single ticket, such were the mechanics of the deal).
I highly recommend it! There are only two differences between having two seats in Economy and having a single seat in First: you don't get addressed by name, and you don't get inundated with free alcohol.
On one segment, the gate agent noted "we are fitting 182 people on
this 757 today". As I stored my backpack in the footwell of the middle seat, the adjacent passenger warned: "you know you're going to have to move that to accommodate someone yet to board; this is a full flight and they've got a long list of standbys".
My response: "oh really ... care to make it interesting?" Indeed, that
full flight carried just 181 passengers.