Ultimately it is up to you. If you feel like you can write an entire novel without an outline to go by, then that is your choice. If you feel that a complete outline to your novel will hinder creativity, then perhaps you should try a rough and shorter variation to the standard outline. But I use a different method. Instead of making a detailed list from beginning to end, try doing it five chapters at a time and leave room in your draft to make changes without obstructing your original purpose for the story. Once you've written the rough draft of the novel, outline the next five, and so on. This will leave you some wiggle room if your character decides to veer into another direction. After all, the characters are not controlled by us, they go about their own lives while we write about them. By using this option, you are not left with an entire wasted outline should something pivotal in your story change because of the character's actions.
Outlines have many benefits overall. It can help keep the story "glued", leaving no room for scattered misdirection. It can help keep the main plot in focus. By knowing the ending (assuming you already know the ending), your writing time is focused on writing instead of sitting there trying to figure out the next scene.
But it's not for everyone so don't feel bad if you don't do it like other writers do. Write however it suits you as long as it keeps you writing.