ORIGINAL: hot tuna please.. I glass all my trout streams. I look at bottom structure, I look for holding or feeding trout in lanes.. then cast to them or the structure.. AS I would on any stream.. I cast to feeding trout in their lanes that I "see: sipping surface or sub.. Now your putting apples to oranges comparing a lake,pond to a stream.. But yes, I also glass Brookie ponds and lakes for under water structure which might hold fish then cast to that.. I glass the Sport creek looking for smallmouth, I glass a clear lake looking for weedbeds that might hold gills or perch.. I glass the SR looking for holding Salmon or Trout to cast to.. Almost always you'll see me with glasses on.. Now If I'm just back trolling plugs or blind trolling behind a craft then yes , whats the point?? You wont see anything until your past that point.. But hey, maybe it might just give you intel for the next go-round.. I use weight, I use what weight is needed for conditions.. I wouldnt fish a dry fly for steelhead in a 30 >40 deg stream but would on a 50>60 deg trout stream in june.. Thats why we adapt to the conditions as do the species we fish for at that time.. Lets be real..
ORIGINAL: retired guy If the water is running at any kinda decent rate it is rare to be able to see fish or even the bottom out where your presentation is landing. To be able to see the bottom where you are standing or a passing fish here and there is IMHO enough to know 'they' are in the area-and that enough to keep up the adrenalin.