if trying to catch a jitney at caesars, bally's or the taj or showboat, you'll be further down the line and you may have to wait as 'full' jitneys pass you by. If taking a bus to a boardwalk casino, and then hopping on a jitney, i'd recommend getting off at the trop or ACH (formerly hilton), if only because there tends to be more seats available down at that end.
if you don't have a lot of luggage you can actually walk to the borgata. but the service only runs thursday to monday on the early bus and the 12:45 bus runs only friday, saturday and sunday. Greyhound has two busses a day that stop at harrah's, departing port authority at 9:30 AM and 12:45 PM.