A lot of my friends believe that it is better to spin the Slots manually, because "Auto spin" are rigged by the casinos... but that is also a myth. A lot of things come into play when a bet is made and it has nothing to do with the "auto bet" feature. (Client Seed / Server Seed & RNG and RTP ...)
Have you pressed the "bet" button, before the reels have stopped.. thinking that it will give you a favorable outcome on your bet? Well, I have news for you... the outcome has been decided in milliseconds after you pressed the button for the bet, the GUI interface happens long after that to display the outcome of the bet to you.

(Go into the developer mode of your browser to see this)
What patterns do you see and how much do you believe in it?
I don't. It is one thing if the slot or roulette wheel is rigged, but if it is not, which is what will happen if you play on a trusted site, there are no patterns. Each spin is completely random and the patterns are more like mental constructs that people make by drawing lines over the past but which are not useful for predicting the future, and if they ever match the prediction according to their pattern with the actual outcome, it is by coincidence. The results are based on pure randomness.
Not only are people trying to construct patterns based on past events, but they would very often neglect the house's edge mathematically. When they calculate the odds they often think that Roulette also having a neutral 0 when they bet on red and black could be neglected because it is statistically insignificant. But it isn't. As you said that are mental constructs and even tiny percentage numbers accumulate to very significant variables when they play repeatedly for a very long time. As a bottom line everyone should understand that gambling is a losing activity and suited for short-term amusement.