I did exactly that last month - except for the part about sneaking out of the office. I had work in Irvine Wed-Fri, so I made plans to arrive early on Tuesday. As it turned out, I missed my plane and didn't arrive until about 1:00 pm. By the time I rented a car and drove to Disneyland, it was about 2:00. But it was still way worth it. I got to see all of my "must-sees", although certainly not everything. I also got a Mickey bar. The Dole Whip stand was OUT OF DOLE WHIP, if you can believe that. But I digress...
I made a point to see the things that they have at Disneyland but not Disneyworld - Matterhorn, Storyland Canal Boats, etc, - and the new renovated Space Mountain (wonderful!) and Disneyland's Small World (Also Wonderful!). Plus they still have Mr. Toad's Wild Ride! And their Railroad is so cute - don't miss that! AND, if that's not enough, it is DISNEYLAND's 50th anniversary.
The park was closing at 9:00 pm, but I was too tired to stay until closing. I left around 7:00 pm and in those 6 hrs had really done a lot. Disneyland is so much smaller than the Magic Kingdom that it's easy to see in a short time. Plus the crowds were light that day, since it was a weekday and school was in session.
Go for it. You will really have a good time!