Boy can I relate; acne was a big issue for me as well. I, like you, am thankfully 90% over dealing with acne, but because I suffered with it for so long, I also have enlarged pores. But rest assured, everyone has pores, and if you look closely, you'll notice them. But it is true that some people have larger pores than others. Here are some helpful tricks as well as product advice that I use, and you can try to see if it helps.
You didn't say what type of skin you have now, and because you had oily skin previously, I'm going to assume that you currently have combination skin.
We'll first address your skin care regime. I would recommend Neutrogena's Pore Refining Collection which gets rave reviews. Neutrogena's Pore Refining Cleanser (compare prices) is gentle enough to use daily, but with the addition of glycolic acid and salicylic acid, you'll be getting a gentle exfoliation which will help unclog your pores. And that is the first step to reducing their appearance.
If you aren't using a toner already, I'd suggest doing so. Toners and astringents are great and deep down cleaning of your pores, and temporarily reducing their appearance. When using Neutrogena's Pore Refining Toner (compare prices), apply it to your face with a cotton ball and let dry.
And lastly, Neutrogena's Pore Refining Cream (compare prices) will be the final step to your skin care regime. It contains Retinol and Alpha-Hydroxy Acid, which helps stimulate cell turn-over, bringing the new layers of skin up to the surface faster as well as clearing clogged pores.
If you wear makeup on a regular basis, you may notice that makeup sinks into your pores causing them to look more noticeable. By using a makeup primer before applying your foundation, you'll see instant results. Primers help make your skin look flawless and keeps your makeup in place all day. Cover FX Skinprep is one of my favorites. (buy direct)
By making sure to continue a consistent skin care regime, you will notice your pores looking smaller and your skin looking overall clearing and brighter.