My first favourite app was CorelDRAW 3 in 1993. It was totally rad. My fingers memorized all the shortcuts. When I was 14, my big Christmas present was the upgrade to CorelDRAW 5. It came in this giant box with a heavy manual and clipart and everything. I loved all of the shape clipping/welding tools.
I switched to Mac around when when OS X came out. Unfortunately for me, Corel soon discontinued their Mac OS X port. Abandoned! I tried to keep it running as newer OS X releases came out, but eventually started the search for a replacement.
In 2007, after 14 years of CorelDRAW, I found lineform. It lacked the high-end CorelDRAW features and the familiarity. Its bezier curve editing was lousy. But it could export full-alpha PNGs which I'd missed in CorelDRAW. It also has a nice, native Mac UI: it even won an Apple design award! Surely this app would be around for the next 14 years.
Unfortunately, lineform's done. Freeverse have moved on to iOS and XBox games, and they've deleted all record of lineform from their website. They haven't removed the .dmg downloads quite yet, but I don't expect those will last forever. The app registration codes have stopped working for me, though I've found a workaround (rm ~/Library/ColorPickers/.com.freeverselib.06020).
Time to start the search for a new vector graphics app. I had high hopes for Sketch, but its current release is flawed. If you shrink a shape and then grow it again, it loses precision and corrupts itself. Ugh.
Perhaps I'll figure out Parallels/VMware Fusion and go full-circle back to CorelDRAW!