Simply that options give you options - you mention one SPY call example and act like that shows that all options are bad. You SIMPLY CANNOT (sorry for the CAPS, but for emphasis) do some things with stocks only that options allow you to do. Here are some examples of why people may trade options:
1. You "know" stock will make a large move but you don't know if it will be up or down. You can buy a straddle - there is no way to duplicate that with stock only.
2. You "know" a stock won't hit a certain level - i.e. stock at 85 - you feel it could go up, but won't go over 90 - you could sell a 90/100 call credit spread - collect maybe $200 and if you are right, even if the stock moves against someone who shorted it and goes to $89, you keep the entire $200. So, again this really can't be done without options, as the person who shorts 100 shares in the example losses $400, but the spread seller nets $200. Note this can often be played on the other side as well, selling bullish put credit spreads.
3. You feel a stock/index won't move much - you could sell a straddle or long iron condor. If index remains unchanged after given time, you get to keep the credit. Again, no way to do this with stocks only. Calendar spreads can also work sometimes if a stock doesn't move much (or butterflies for that matter).
4. I do personally feel the leverage with options is much better then using stock margin, and is much, much safer. This is IMO.
To help you understand the power of options more maybe, consider your 118 SPY call in these cases instead of just a small move - what if SPY went to $128 or even $138 - now compare the profit % to buying SPY even on margin. Also, consider spending $300 and then SPY falls to say $100 - if you bought 100 shares at $118, the losses are $1800 - the one call will only cause a loss of $300.
I think there is very little limit to what options can do, but you need to decide if you want to use Theta (time decay) or Delta (price moves) or vega (Volatility changes) to your advantage and set up appropriate trades.
JJacksET4