Oh, the Illustrator. I have some sort of love-hate relationship with that program. Compared to its older and more mature brothers Photoshop and InDesign, the user interface just lacks that something. Illustrator has always been the difficult app to master and to really do something productive. But it’s also been pretty much the only real vector app.
I have quite a long history in printing media, where Illustrator was some sort defacto-tool for any vector-image use case. In the era of web design, the Illustrator has gone to one of those rarely used programs. But times they are a changing.