Toss those "should" do ideas to the side. If you've already lived with your partner for some time and have the basics covered, don't worry about registering for those things. Don't add things to the list to take up space.
What websites come to mind that are simple and fast. You want your guests to enjoy their gift-giving process. Find a registry that works for both of you.
2. Choose a registry that's easy for everyone to navigate.