Okay, I was playing a couple hands at the noob table today (about 7:35-7:40). The bet was 10 and I clicked the "call" check box. Just before I pressed the call check-box the player next to me clicked his all-in, causing me to go all-in.
I ended up winning the hand because I got lucky with a straight deal, but I had a weak pocket hand I would have never made that all-in bet.
The lack of a delay, or some sort of other UI protective element, allows for a mis-click to adversely affect game play, which is not within the spirit of the game.