i still do it in diamond leagues time to time. the good thing about cannon rushes especially in team game is that, while the biggest flaw is your base being opened for counters, having an ally generally nullifies that, and cannons are easy to contain people while yourself, or your ally expands. and having a surplus of minerals (chrono are 100% to probes lol) and gas means you can suddenly surprise people with high tech units like void rays when they are too focused on getting counters to your cannons (siege tank/marauders/bunker x spine crawler/roaches/trausfusing or creeping queens x stalker [played well, void rays dont have much problems dealing with small amount of stalkers especially backed by a wall of cannons]/immortals etc.)

hell, look at GSL, people even do bunker rushes, cannon rushes in such a HIGH LEVEL tournament that involved a total prize pot of 170k USD. the entire point being that, while basics are good and all, you still need that fast thinking to adapt to situations and decent apm to win games/advance in leagues, and ALL THAT, comes with experience/practice or in a nutshell, simply playing more.