That is one of my primary uses - setting dozens of orders to 'delivered' in one shot. I've also tweaked it so that if we change the status to 'willcall', an email is generated using a template in catalog/email with instructions on picking up tickets at the willcall desk.

We also use the batch invoice functionality. It's a little odd when you have many (>5) invoices at once since the browser is jammed with many frames, but it works well. Again, I tweaked it to align the mailing addresses to the window envelopes we use, and to add other event information at the end of the invoice.