You book breakfast at 8:00am, you arrive and are served breakfast at 8:00am (or likely 8:30am, but that's just the nature of ADR). You are served food, you pay your bill, you leave. Once you walk out the door, anything "owed" to you by the contract (for lack of a better word) you made with Disney by booking the ADR is fulfilled.
Disney does not promise early rides, extra rides, or front of the line privilege with a pre-park ADR. Disney "must know" that's why you wanted an 8am ADR for BOG? Maybe Disney thinks you....well....you want to eat at BOG for breakfast?
Yeah, so one poster got let loose before the RD crowd and another had to wait behind it while yet a third got mixed in with the RD crowd. So? I paid for a preferred room at my resort. The person checking in before me gets a free upgrade to CL, the person checking in after me gets a free upgrade to the room right next to mine (even though they paid for a standard room). Me? I got exactly what I paid for. Is it "fair"? Of course it's fair in the sense that nothing in life is "fair". Sometimes you get free upgrades, sometimes a CM lets you ride again without going through the line, sometimes the ride breaks down right as you buckle your seatbelt, sometimes it's down for refurbishment EVERYTIME you plan a trip to WDW.
Bottom line is, you wanted breakfast, you got an ADR for breakfast, you ate breakfast. Any additional bonuses, benefits, pixie dust, etc are just random luck. You can either say "well, that sucks" and move on with your day, or you can dwell on it and let it ruin your morning/day/trip.