i watched all the fillers because i felt like it. while it's true that they were exasperating because we were all like "get to the plot, damn it!" i actually found that most of them were quite amusing. i particularly liked the kakashi's face episode *laughing*.
besides, i found that most the first hundred and whatever episodes that weren't filler were really heavy and needed a break from the intensity. the sheer quantity of fillers wasn't necessary, though.
point being, they're not necessary, but if you feel like watching some frivolous naruto fun, why not?