ACR CREW CONCERNED ABOUT SIMULTANEOUS PARALLEL TKOFS AT CLE.

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FLT PLANNED CLE TO EWR. DURING TKOF RWY 5L; AT APPROX VR; I NOTICED AN EMB145 PASSING US; AND TAKE OFF ON RWY 5R. TKOF AND CLB WERE NORMAL. AT NO TIME WAS THERE AN AIRBORNE COLLISION HAZARD AND SEPARATION FOR MANEUVERING WAS ADEQUATE. TWR ISSUED A L TURN TO 320 DEGS TO INCREASE SEPARATION. THEY ALSO ISSUED US A PHONE NUMBER TO CALL ON LNDG AT EWR. AFTER CALLING; CLE TWR ADVISED THAT THEY HAD LISTENED TO THE TAPE AND ADVISED THAT WE HAD 'NOT DONE ANYTHING WRONG.' CONDITIONS LEADING UP TO EVENT: CLRED TO CROSS RWY 5R AND TAXI INTO POS AND HOLD RWY 5L. AT THAT POINT; CLE TWR ADVISED A DELAY FOR TKOF CLRNC. WE WERE IN POS FOR APPROX 5-7 MINS. TWR ELECTED TO HOLD US IN POS WHICH REQUIRED ALL ARRIVING AND DEPARTING TFC TO USE RWY 5R OR RWY 10/28. TWR WORKLOAD APPEARED TO INCREASE DUE TO LOSS OF RWY 5L. TWR KEPT US ADVISED OF IMPENDING RELEASE; ISSUING US A 2 MIN NOTICE. SHORTLY AFTER (1-2 MINS) WE WERE ISSUED; 'FLY RWY HDG; CLRED FOR TKOF.' HIGH WORKLOAD; HIGH TFC FLOW; LOSS OF ONE RWY; BUSY ATC; AND ON-TIME CONSIDERATIONS.