Yeah... Until you get yelled at and runover by the heavies. We fly Seminoles into MEM on a pretty regular basis and let's just say ATC doesn't exactly roll out the red carpet for us. And for some strange reason they think the phrase 'Climb to 5,000 NOW!' makes the poor little twin climb faster...

Point being, flying in busy airspace is very good practice. Flying into -extremely- busy airspace where 95% of the the traffic arriving touches down on the runway faster than you cruise en route... maybe not so good