I never used Instrument tracks in SONAR because I like to treat a sythn's audio output the same as any other audio source, which it is. That includes grouping synth audio into track folders, adding aux tracks, combining synths into busses.
And Mixcraft does lets you do all that. It's just that the output is visually separated from the other mix elements, and the synth's audio effects are now inserted into the Mixer (Console) view. And that's the biggest adjustment I'll have to make - using the console. I am used to doing everything in the Track View and PRV, almost never the console. With Mixcraft I can move the console to another display, but it's always going to have to be up.
This was one of the motivations I had for buying a single, bigger monitor. That and watching concert videos on Netflix/YouTube, of course.