I did this for 2 days. And it's hard to explain how difficult it was. There's a huge number of GA pilots who are in the air helping. And even then there's not enough.
But with that many people flying in the same airspace it becomes a TON of work. And an additional pilot in the airplane is more than just a nice to have. It's really rather important in order to be safe.
I am glad I did this. I'm also glad that I didn't have a second pilot for today.