Now the hype has died down a little, would people recommend still joining the smiler queue straight away in the morning? or go on all the other rides then queue later in the day?
In my opinion, the best person to answer this is yourself as it depends on your circumstances.
If you're a regular visitor to AT and travel times are flexible then I would say go at the end of the day. The last two times I've been it's a 30-40 minute wait at 6pm when ride lines close. By this time the park is emptying.
However, given the number of hiccups that the ride has experienced, if you're travelling a long way to specifically to go on The Smiler, then head there first. You'd kick yourself if you left it until the end of the day and it broke down and didn't re-open.