But you can create a lot of space with everything else too. Ever hear that travelling delay? Pan your synth right and adjust the delay to the left. Same with verbs, creates a lot more space to it.
Vocals sounding bland? Pan them to the right a bit and add another layer with chorus to the left.
Want more movement to the LFO'd riser before the drop? Make 2 of them with different LFO phase and hard pan them left and right.
A Bass to surround you? Make a highpassed layer of it, duplicate, pan 25%L & 25%R, flanger left and LFO filter on the right.
It's like a 3rd dimension to the music in addition to frequency and level.
---------- Post added at 05:34 ---------- Previous post was at 05:32 ----------
Also be careful with the stereo expanders, some of them introduce a stereo offset to the sound (delaying the other side slightly) that makes it sound phat but it might introduce stereo phasing trouble, like making the punch of a kick disappear.
If you are using Ableton, then you could duplicate the channel you want to effect and put a Utility effect on each channel
Then pan to one side using utility and effect accordingly, you could use utility again on the duplicate channel and pan to the other side and effect differently