I enjoy using Illustrator too! It's so weirdly satisfying once you get the hang of it.
One thing to note about Illustrator: Although it has 'illustration' in the name, it's surprisingly not predominantly used for illustration. This is because the vector workflow is very different to painting. It can't handle subtle brushstrokes and textures very well, so many styles of art take a long time or crash the program. You
build your image rather than draw it, using carefully defined shapes. But that isn't to say you can't make
amazing art - you just need to work in a particular style that the program is suited for. Many artists thrive because of Illustrator's limitations - it's all about the type of art you want to make.
This is a popular example of artwork made in a raster program (like SAI or Photoshop)
This is a popular style of art possible in a vector program (like Illustrator)
A quick google for artwork made in these programs shows instantly that they produce a very different look and feel.
At the sacrifice of scaling, raster programs provide a natural painting experience, and are most like traditional art. Whereas with a vector program you are mainly making artwork out of shapes rather than brushstrokes, which allows the computer to store the image as mathematical points in space instead of pixels. This lets you scale your art to any size without losing resolution - an incredibly powerful tool.
But most of all, Illustrator is amazing for making graphic design assets. If you're creating logos, infographics and website features, this is definitely the software for you.