The nature of pads is that they're fillers, audio spackle for making sure there are no holes in your music. Just as when applying putty to bathroom tiles, you have to scrape away the excess. That means brutal amounts of filtering and volume automation so that they fill the gaps without masking the percussive and melodic elements.
There are two ways to approach this: subtractive and additive. You can either start with a thick pad and carve it to suit the mix, or you can create your own custom pad to more precisely fit the cracks you need to fill.
Omnisphere is the king of pads, most of which are made from those Roland synths you admire, but they often require a lot of shaping and reduction. Dimension Pro has a few nice pads in that category, too, that aren't quite as opaque but sill need some filtering. Z3ta+ can do some decent pads, too, that aren't quite as gooey.
More and more, I lean toward option #2, building pads to order with Zebra. I look to the patches of Joseph Hollo and Howard Scarr for inspiration and as a starting point.