Do you keep a budget?

As in, do you write it down on a ledger, account for everything in and out, make budget forecasts, try and save, etc.?

Yep,

I have an excel spreadsheet set up and keep track of every dollar that I receive or spend as well as a front page that summarizes the year to date. I have been doing this for almost 4 years.

Not actively, no.

I made a budget: accounted for rent/utilities/etc, allotted for savings and outings and stuff. But now it's mostly on autopilot since my spending habits are established and I've got a salaried position.