For me the worst is
"G-ABCD, orbit left over Alderley Edge,1500 ft QNH,expect 45 minute delay due inbound IFR traffic"
They've got autopilots I haven't.
I got something similar at KLAS once, but either the controller decided to be nice and help me out, or he didn't want a light IFR airplane in his mix to handle.
ATC: Expect 1 hour delay for IFR traffic.
ME : Understood. Would you prefer I get an IFR clearance from FSS? Or can you handle a pop-up clearance?
ATC: Cleared into Class Bravo Airspace turn left heading..... remain VFR
Come to think of it, KLAS seems to be the worst offender in giving a very low priority to VFR light airplanes. Another time during VFR flight following, when I was overflying Bravo airspace but checked in for traffic advisories:
ATC: Turn right heading 270 for traffic
ME : Turning right 270 (90 degrees to my desired course)
After 10 miles:
ME : Cancel flight following. Turning back on course.
ATC : Uhh ok.
Now I don't bother checking in with KLAS approach when overflying them.