Hmm yeah, probability and other auto-magic processes are no substitute for good programming IMHO, sure they have their place but it would be wrong to consider them even a passable substitute to getting busy with the edits. Leave nothing to chance 
Edit - I never seem to enjoy the results of probability, I like to use iterations though as these are by their nature guaranteed to happen when expected, which of course amongst other things can be used to get more milage from a limited sized grid. I do also enjoy using different sized step grids against each-other because again this can be predicted to a certain degree, so maybe my dislike of probability is a result of the brains attraction to looking for patterns, where intricate patterns can be a delight and probability just sounds too random?