As noted, it makes sense to take more/larger steps during the summer/fall season due to the warmer water temps, aggressive fish and also due to generally fishing a floating line (with a skater, for me) where the fly is usually swinging as soon as the fly lands on the water. However, I will take smaller steps over known holding water or make multiple casts over known lies. I may also slow down in areas I have most confidence in like the upper corner of a run, juicy seams, areas where boils/wakes indicate underwater structure, etc. Sometimes I even step back upstream and work back through such areas, just to be sure no one's home.
In the winter/spring seasons, I take smaller steps since the water is colder and because my dry line swing method is less able to keep the fly deep throughout the swing so I try to cover water more carefully. Again, I slow down in areas of known holding lies and even make multiple passes in some runs (time and crowds permitting).
Regardless of the season, I sometimes fish at whatever pace my mood moves me. For instance, during summer/fall, I may be fishing on a big run that seems to call out for big steps and covering a lot of water quickly, but I'm just wanting to relax and take it all in, so I just cover the water at a leisurely pace, simply allowing the experience of being out in God's creation refresh my soul.
As to fishing pressure, I have come to be less and less affected by it since what keeps being revealed to me is that steelhead become rested more quickly than we may realize. If you are able to fish water that others have been fishing but has had some time to be rested, your chances can still be good. I've gotten summer and winter fish after others have fished the same water, after multiple boats/sleds have gone through, after gaggles of floaters/rubber duckies have gone through, etc.
Ultimately, one way or another, if a guy gets out, keeps a hook in the water, and fishes in a manner that has been known to catch steelhead before, the fish will come.
Todd