As a non-judgemental sidekick. It helps with flesh out a random thought, it helps me understand a random coding problem, it helps me see why a vuln exists in a particularly difficult-to-read piece of code, and building outlines for reports and presentations that I'm too lazy to deal with. It is also starting to replace the random Google searches I used to do.

To boil it down, it's my "10-minute task" time saver.

And my use of it really picked up when I started using GPT4. It's head and shoulders above GPT3.5 in terms of quality and clarity of output.