The content is great, and most of it is available on Open Courseware, YT, etc, but here's what else you get by officially going through the program:
- the amazing community of TAs
- the assignments
- the feedback on reports & projects (either automated, or through TAs)
- the collaboration with other students on Ed, Discord, Slack, etc
- the forcing function of deadlines, having to study for exams, etc
- free access to academic libraries, IEEE, ACM, O'Reilly, etc
- access to software and services, educational packages from GitHub, Wolfram, Google Colab Pro, student discount in a bunch of places, etc
Another underrated aspect is GT's ability to preserve rigor of the program overall, despite the scale and number of students in some courses (the most popular ones have 1,000-1,500 students per semester).
If you're on the fence on applying, I strongly recommend you do. The program is affordable enough that there's no harm in trying for a few semesters to see if matches what you're looking for.
Glad to answer any questions.