Spike shoes are pretty much a requirement if you're using flakes, and just shy of a requirement if you're not using flakes.
They allow you a lot longer time to get on the still wet coating and correct any errors you see, and there are often little spots you miss and just can't see until you step off the floor and stand back a bit.
And as Ruddy mentioned it's a good idea to roll out the coatings in two directions perpendicular to each other, that's especially the case when you're putting down a clear coat. Yes, you could use street shoes, but they displace a lot of wet material and clear coats are generally pretty thin - often 4 mils or less - so as they cure a big foot print will leave a thinly coated spot, or worse a permanent visible imprint.
So if you have a small area with easy access and good fortune, no spikes needed - for the rest of you - use those spikes.
And even if you do wear spikes a cardboard "landing zone" is a good idea, unless you like the look of little epoxy dots on your driveway.