It is the same for us today. Taking refuge in the Three Jewels isn't something to check off your "Things to do before I become a Buddhist" list but rather a personal acknowledgment that your life is out of control (like is the case for all of us) and that you need help. The refuges are meant to remind us that there is a way out and that it has been done before by Buddha but that the way out requires complete surrender. However, it's not a surrender to Buddha himself but rather to his example because Buddha isn't a savior like Jesus. We are saying, "O.k., I give up in trying to find relief externally, and figuring this out on my own. So, I am trusting in Buddha's example that it can help me as well." So, in essence every time we recite refuge in the jewels we are reminding ourselves of that reality. For, It is only when we let go that we find true freedom. Or, as the wise (yet rather crazy), "Master" Tyler Durden says in the movie Fight Club, "It's only after we've lost everything that we are free to do anything."
Then there are of course the "The Five Precepts" vows, which are a list of commitments that have been shown before by well-known monks to reduce suffering but they aren't a "naughty list." There isn't anyone that's going to be checking up on you if you don't keep all the precepts because, frankly, that would be counterproductive because in Buddhism there is no one that you need to please, appease or obey. Buddhism is the classic, "D.I.Y" or "Do it Yourself" motto because no amount of bowing, vowing or wowing is going to end your suffering. You and your karma are your own judge and savior.
I'm not saying you won't need teachers and other helpful guides such as the Four Noble Truths and the Eight-Fold Path. I'm simply saying that being a Buddhist is not about checking off boxes on a list and off you go to Buddhist retirement. If you look for Buddha--you won't find him anywhere but inside you. That means that to be a Buddhist, one only has to be a human being who has seen the useless help that the external world offers and actively live your life to find relief from within yourself with the example of Buddha as your guide. You have to live it to be it is another way of saying it.
Another Buddhist I was reading today inspired this post with a story about her desire to "become" a Buddhist and her teachers response to that desire. She wanted to know when she'd be ready to become a Buddhist. Her teacher wisely replied, "You know you're ready when becoming a Buddhist is simply a recognition of something that has already happened." So, perhaps the question isn't, "How do I become a Buddhist" but rather, "How do I reduce my suffering?" Because it is that goal, which defines most "Buddhists." If you follow the Buddha's example, seek to put his teachings into practice and ask for help, support and guidance from the wider Buddhist community (Sangha) then I'm sure you'll have your question answered by your own actions.