Are you doing a first look? Why or why not? For most couples, there are two primary reasons why they choose not to do it: first, tradition; and second, the emotional reaction of seeing each other for the first time as the bride makes her way down the aisle.
If you've decided you don't want to do one, that's fine! It's your day, do it your way. But if you're on the fence, here's my two cents:
Regarding tradition, most of us have heard that it's bad luck for the groom to see the bride before the ceremony. This notion actually dates back to the tradition of arranged marriages. The reason the groom was not allowed to see the bride before the ceremony is because it was believed that, if he had the chance to see his bride, he would be more likely to call off the wedding. How romantic. The non-traditionalist in me says you and your soon-to-be spouse can probably come up with some better traditions of your own to incorporate into your day :)
As for the emotional reaction to seeing each other for the first time as you walk down the aisle, I totally get it. It should come as no surprise that I love a good, raw emotional reaction. And sometimes it happens and its wonderful! And sometimes, the reaction is internal and not much happens externally. Some people (like me!) are naturally more reserved in front of a crowd and they might not have that monumental external reaction for a dozen reasons that have nothing to do with how they actually feel about seeing their soon-to-be spouse for the first time. Bottom line: there's no way to predict how you and your partner will react, so if you're choosing not to do a first look because you want a certain photo of your honey shedding a tear or falling to his knees when he sees you, there's a chance it won't happen, regardless of whether you've already seen each other.
NOW! Here is why I think first looks are great:
First, if reaction is what you're going for, this is a much safer environment to get that reaction. Just the two of you, away from the crowd, away from phones and cameras (except for mine and I'll try to stay out of your way). Without the pressure of a crowd or a ceremony timeline, you have a few minutes to truly enjoy that first glimpse of each other. You'll likely be running high on emotions and the freedom to be able to touch each other, to hug, to wipe each other's tears, and to tell each other what you're thinking is invaluable.
Relatedly, by setting aside 15-20 minutes before the ceremony for a first look, you have a chance to just enjoy a moment of quiet together before the day sweeps you away. For my fellow introverts, this moment of peace with your person can ground you and recharge your battery so that you can be ready to entertain!
Finally, as a matter of practicality, by doing a first look, you've made it possible to do all the group photos before the ceremony. This means everyone gets to head right to cocktail hour/the reception right after the ceremony! It also means you're not chasing people down for group photos when they're ready to party. It can be a big time-saver! Also, while I'll still pull you away for a few minutes at sunset for a couple more bride + groom portraits in that beautiful evening light, you're essentially free from photo obligations before the ceremony even starts!
Ultimately, whether or not you decide to do a first look, your day will be beautiful. As always, feel free to throw my two cents right out the window and do exactly what you want to do!