I've tried the sneakers-disguised-as-clipless-shoes before and didn't like them at all (Chrome and Mission Workshop DZR). Here's how I do it now:

For work commutes, I just wear my mtb Sidis, since they're the most comfortable and I have to wear dress shoes at work anyways, which I wouldn't ride my bike while wearing.

For quick errands and putting around town, I wear sneakers or (gasp) flip flops on my commuter bike, which has SPD / platform combo pedals (XT touring pedals mmmmm), or my cargo bike, which has bmx platforms.

If I'm going to be riding around all day or riding far before stopping for a while (longer distance bike picnics, S24O's, exploration rides w/ a bar stop at the end), I'll just wear my mtb shoes and depending on the destination and bike/bag I'm using, pack some flip flops or sneakers to change into.