Everyone is entitled to their opinion, but mine is that there is bound to be a multitude of stomp box effects you could insert and get good results. Phasers, filters, Chorus, Flanger, EQ, compressors, loopers, noise gates, ringmod, sustain, resonator...I once had a BBE Acoustic Sonic Stomp permanently inserted in my Moog Voyager effects loop because it made the oscillator mix sound much brighter, resolving one of my biggest complaints with that synth. Nothing wrong with trying out an auto-wah or the ten kajillion varieties of distortion available from pedals. Even if all you want is to color the sound and remove some harshness.(or add some!) It's fun to experiment and I've always found at least a few useful applications of the above.
Flanger pedals in particular seem useful for single-oscillator synths to simulate two identical waveform oscillators tightly tuned together, in a way more interesting than a pitch-shifter, although chorus pedals generally less so for simulating wider tuning differences.
"Lots of people are nostalgic for analogue. I suspect they're people who never had to work with it." - Brian Eno