Well, I do just at the minute. But that's because I've just got back in after doing 8x30s with 30s rests. I should have done 10, but was so jiggered, frankly, that I came home.
I'm of the opinion that intervals are like medicine. You may not like it at the time, but it'll do you good in the long term. Provided the side-effects don't get you!
'Twas a gorgeous day for running though. Blustery, but sunny and dry with lovely springy grass to bound over.