I think it depends on your aim. If your interest is quickly familiarizing yourself with the names, using the simulators helps. Each time you go through one, explore the players you've chosen. Just a Google source. After running many simulations, you will be surprised how the names stick in your head and how you begin to understand the players. Then you can begin to explore position by position.
It's great to see as many plays as possible, but for the most part, you see the highlights and miss the lowlights. I always thought the late, great Joel Buchsbaum, the original guru of draftnicks, had the right approach. He refused to call himself a scout. He referred to himself as an information gatherer. He relied heavily on the opinions of the professionals he trusted. By being humble, he developed a massive network of scouts, coaches, etc. And he had a board that very closely resembled the consensus NFL board.
If you want to understand which players individual clubs are likely to choose, pay attention to their beat writers. They will have a better idea than most of the draft experts. A beat writers' mock -- one from each team -- is usually pretty accurate as the draft approaches.
As for really digging into the players, Brugler is great and very comprehensive.
Finally, understand each club's tendencies. They tend to lean to choosing certain positions earlier and the particular types of players. The Cowboys' general aversion to safeties and to players who lack length is a pretty good example.
The Giants like to pick the big guys. That really had generally been true, for the most part, since the Parcells days.
Then pick some pet cats and enjoy seeing what happens with them come draft day.
Most of us are wrong most of the time.