We just returned and took the Supershuttle from LAX to DGC Hotel. The cost to any hotel in the
Disneyland area is $14/person + tip. You do not need to make a reservation from LAX, but for your return trip you will need to your reservation 24 hours in advance and they like to pick you up 2.5 hours before your flight.
Supershuttle is an 8 person van. You catch the Supershuttle outside of baggage claim under the supershuttle sign and tell the attendant where you are going.
Since we did not make reservations for our return, we took the Aiportbus back to LAX.
Airportbus (full size bus) runs every half hour from most locations around Disneyland area hotels and Stops directly at all the Disney Owned hotels. Cost is $16/person ($25/RT) + Tip. Since they run every half hour, it is
easy to decide when you need to return.
Someone told me the cost of a taxi to the Disneyland area is about $37.
Both are very easy. I did not know about airportbus prior to our trip, but the roundtrip price makes it the most affordable and I would probably take it again.