When I was in the middle of applying to Oxford I felt the same sort of thing, I wasn't sure I wanted to go, the idea of interviews and finding good quality essays and writing the subject statement for my course all looked on the face of it like too much effort. I spent a while after sending off my essays hoping that they'd got lost in the post so that my application would be voided. But in the end it's not actually too much effort to update a couple of essays, or to sit an exam that's about aptitude so doesn't require knowledge, or to write about your background in a subject you've never studied, or jump through whatever the hoops that your course sets are.
The best part was the interview: I met lovely people and had a couple of relaxing nights; I got away from the endless stress that teachers at A level is conducive to good results for a couple of days; I got to talk to experts in a field in which I was interested. In the end it doesn't matter that I didn't get an offer, or that it required a couple of hours of extra work, because it was worth it for the relaxing, interesting break that it provided.