Stagnation is fine for some jobs—when I was a dishwasher at The Earth Kitchen vegetarian restaurant, I enjoyed shutting off my brain and focusing on the rhythmic scrubbing of burnt pans, the slosh and swirl of peas and carrots in a soapy drain—but professionals, particularly web professionals, are either learning and growing or, like the love between Annie Hall and Alvy Singer, becoming a dead shark. If you’ve stopped learning on the job, it’s past time to look around.
Source: If Ever I Should Leave You: Job Hunting For Web Designers and Developers · An A List Apart Column