If you want a "shoegaze" guitar, use chorus. If you want a lead vocal to sound like it was sung by three people, use the Doubler 2 Stereo.

If you cannot afford vintage hardware, several plugins deliver the Doubler 2 Stereo effect with surgical precision:

Duplicate your lead vocal track. On the duplicate, insert the Doubler 2 Stereo set to 100% wet, heavy detuning (+/- 12 cents), and heavy compression. Blend this underneath the dry vocal. You get a "whispering crowd" effect.

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: Users can slightly detune the extra voices (measured in cents) to create the natural pitch variations found in real vocal doubles. Delay Modulation