"Admittedly, it takes a bit more than counting snails to see evolution in action"

You're not counting just snails, you're counting their polymorphs which are caused by mutation in the alleles that control colour variation in the snail's shells, each combination of bands and colours being known as polymorph. As these snails have a high reproductive rate by repeatedly observing them we can see how the polymorphs vary within populations over time. We know that the various polymorphs of Capaea sp. are more prevalent in certain areas, and part of this variation is due to the local climate and so as the climate alters we see the polymorphs change too.

This change is due to evolution; we are seeing natural selection as it happens so in fact, you're wrong. Counting Capaea sp. is an easy, testable and perfect way to see evolution in action.