We did the Disneyland Park-tour at DLP two summers ago. Back then, the booking was indeed by phone, but the advantage was that if you were the first for a given date/time, you could select the language the tour was given in.
Being Dutch, we opted for a dutch guide which worked out perfect... it was just the 4 of us (me, wife, son and daughter) with the dutch-speaking guide. We walked from City Hall to the Castle (getting a peek inside Walts'!), to Fantasyland and Frontierland, had a look-around in Agrabah's restaurant which was at the time closed after lunch, and back through Discoveryland. We walked for about 2,5 hours.
At that time, the prices were half of what they are today (they doubled not long after our tour), so we paid €80 for the four of us. I can recommend it to anyone, but think the currect prices are a bit high.