When I play rock or soul it's pretty much a straight 4 string with rounds or flats.
When I play functions then it may be an octave, chorus or filter to approximate the bass on various recordings
When I play with my sefardic Mediterranean band, then I use octave, filter, tremolo, delay, drive, phase, freeze... (Not all at once).
The conclusion is that the dirtier the guitars, the fewer effects I use.