Thank you!
MyTraffic 5.4b has realistic schedules (You can download the 5.4c update from their simflight forum which now adds 2013 traffic schedules). If a Ryanair is scheduled to land at Stansted at 13:05 on a Tuesday it will land at that time and day in the sim. It will not take into account delays or cancellations.
MyTraffic 5.4b is required for MyTraffic Live to work. In theory when using MyTraffic Live if there is a real life delay, cancellation or diversion it will be represented in the sim. However, it only includes the "bigger airlines in the US, Europe, Japan and Australia" but does not list which airlines are included. You also have to pay a subscription and have to buy it every six months and there are no refunds. The only reviews I could find are two from simMarket and they have both given it a 1 star rating.
If you don't buy the live update then just MyTraffic 5.4b alone will be fine:
http://secure.simmarket.com/mytraffic-x-professional-5.4-b.phtml
If you fly to/from a major airport such as Heathrow, Gatwick, Schiphol or Frankfurt-Main, depending on the time of day and date you will have many planes taxiing around, queuing up for takeoff, approaching and landing. I do not fly online or use Vatsim so I am not sure how problematic this could be.