I went to Walt's Grave last April, with fellow DISers Yvet & Emiel, who were here for the ABD Trip.
I had never been there before, and was blown away by the beauty of the place and how big it is in the middle of LA. We first went to Walt's Grave, and it sits in a corner garden, outside of this large Mausoleum in a patriotic section of the cemetery. I got tears just entering the courtyard.
After we went to Walt's grave we went to another mausoleum to see a stained glass window of the Last Supper. It was a little presentation that they give every half hour.
I highly, highly recommend visiting the Glendale Forest Lawn Cemetery. Make a day to go there, and then have lunch in the
Tam O'Shanter Restaurant, which was a hangout of Walt and his illustrators back in the day.
Nancy (yellowmickeyponchos) did a blog on visiting Walt's grave, and it has pictures and a really nice write-up.
10/28/11 - Moments of Reflection-Paying Respects at Walt Disney's Gravesite
She also talked about it on the DL Podcast:
10/27/11 - Annual Passholder Parties, Forest Lawn Cemetary