You are confusing aerobraking with aerocapture.
Aerobraking is used to circularize an elliptical orbit into a circular one after orbit insertion, and it has been used a few times on the following missions:
- Hiten: this was a demonstration mission in Earth orbit
- Magellan: Around Venus
- Mars Global surveyor
- Mars Odyssey
- Mars Reconnaissance Orbiter
- Venus Express
- Exomars Trace Gas Orbiter
Aerobraking has never been attempted with gas giants.
Aerocapture is using a body's atmosphere to slow down a spacecraft for orbit insertion. It's been investigated but never used as a technique. A spacecraft would need thermal protection and enhanced structural strength to survive the maneuver, which adds weight. It's a risky option: if you get it wrong the spacecraft either re-enters and is destroyed or skips off and heads off into deep space. The risk doesn't seem to be worth the cost savings.
Aerobraking can be much more gentle and controllable, taking place over many orbits, controllers can measure orbit change on each pass to understand the spacecraft's actual interaction with the atmosphere. Aerocapture is a one-shot deal.