I'm for whatever gives me games faster and cheaper. I'm not "Loyal" to any particular piece of software - because that's all it is, a piece of software. Hard for me to get all "emotional" over lines of code someone else wrote.
And of course, I use both. I have both Steam and Origin installed. If a new game has come out and it is being sold on Origin and Steam, I will literally go with whatever service provides it cheaper (it's usually Steam, by the way). If I can't get the game on Steam and I find it being sold on Origin for a price I am willing to pay, then I'll get it on Origin.
I will look at whatever options are provided and pick the one best for my wallet and sanity. As far as I'm concerned, that's all there is to it.
What I'm surprised is the moral indignation over EA's attempts to enter the market. Why is it "immoral" for a company to pursue the bottom line and increased profits? That's normal. That's how businesses function. It's normal for consumers to seek out the most cost effective method of purchasing things, and it's normal for business to want more money. That is why they are business after all. They are not charities.
Steam is a distribution network and storefront. It is not your friend. It is a business. Valve just happens to be more consumer savvy and intelligent than EA. Both are motivated almost solely by profit, but Valve are better at making the customer THINK that they are his or her friend. In reality they are not. Sorry, but Gabe Newell doesn't care about you. He never did. He doesn't even know who you are. Neither Valve or EA are your friends. I will enthusiastically claim that Steam is a better service than Origin - more discounts, faster download speeds, more security and a far, far, far wider selection of titles. But just because I find Origin to be an inferior service does not mean I find it an "evil" service. What is "evil" about competition? Competition is USUALLY seen as a good thing, isn't it?