Some of the above responses are funny....
Better equipment?
Your average SR22 (or equivalent) is light years beyond what most airliner cockpits have in them. I have my radar which gives me a picture ahead. I cannot pull up a synoptic view and see the overall picture once airborne. I do have the ability to read updates via data link of general areas but I have to get out a chart and plot the coordinates. Most steam gauge GA planes are flying around now with Foreflight or something like it. That gives the pilot a LOT of information in an extremely handy format.
Automation?
Yes, I have two A/P's, two Flight Management computers and a world wide database. I fly long haul flights. Leaving Friday night on an around the world flight. 12 days and 6 landings (to be split between 3 pilots). The manufacturers and the FAA wanted to get the pilots out of the equation as to flying....until something goes wrong and then due to a lack of basic flying skills are critiqued that we didn't do a better job in the most critical phases of flight (takeoff and landing). The automation (read the reports from Air France in the Atlantic and you will see what automation did for them).
Jet Engines....Undoubtedly an major advantage. Performance requirements far exceed anything that any GA aircraft can do (well maybe a Gulfstream etc.) We have on board performance computers, procedures etc. in the extremely unlikely event of double engine failures...but it still comes down to flying the airplane at that point. When I flew fully loaded Navajo's, my briefing was the good engine will help us find a crash site....now it's "We lost an engine.....ok, well I guess we had better do something...tell them we are going to be late for dinner".
Procedures....out the wazoo
You will put the flaps down now, you will put the gear down now...you will recite these lines...verbatim...
Case in point. Landing DFW, my F/O made the 500 foot call...on speed, sink 700. We were getting a company line check. He was debriefed on an improper callout. The book says, according to the checkpilot...500 feet, on speed, sink 7...NOT 700!
Well isn't that special...do I feel safer now
GA can have the same professionalism and in fact some of the most professional pilots I have flown with are GA pilots...it is your ATTITUDE