Not sure I hate the idea -- at least tax money is put to very good use. But for those for whom it's more than merely recreational (e.g.: medicinal use), I wish they'd sell a tax-free version. Too prone to abuse I guess.
However, heading to a coffeshop[1] isn't a big deal. It's a person behind the stand, you pic what you want from a menu, and they hand it over. Very nice and friendly, not dissimilar to ordering at a cafe.
I don't look under 25, and they've NEVER asked me for an id at any of these places. It surprised me in the US that even to sell alcohol to someone clearly over 40, they still ask for an id.
[1]: Stores that sell weed here are called "coffeeshops".