I sort of agree with the OP to a certain extent... Large tanks with large preds CAN be boring due to the fact most o the time its hard to scape a tank in hopes that it stays in place for an hour or more, making them in essence boring to look at...
These days i find myself staring into my smaller planted tanks more due to the more natural way my fish act with all the plants and added deco...
Although with this being MONSTER fish keepers, most will probably disagree...
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I agree (kinda) when you have a big tank with monster fish its really cool and all, but you cant really do much with the decor, Lets say you have a 220g with PBass, Oscars, and different Monster fish, those fish produce alot of waste so MOST people will keep a bare bottom tank to be more clean and healthier for the fish and the most you could do with decor would be a nice piece of driftwood and a couple live plants like Java fern or Anubis or fake plants, that would be it. Alot of the videos ive seen online with people who have massive tanks with only fish in a bare bottom tank whith a black background but the question was about the size of the tank not the size of the fish so if you have a 220 that's planted with alot of different plants and breeding pair of Dwarf cichlids or discus then its gets really interesting and you go to your tank to see all the new things that happened like if a plant colored up or grew a new leaf or if there is pearling or if there is a new batch of eggs etc.
So IMO Big tanks are good, just depends on what you do with them.
Big Tank + Big Fish + Bare bottom = Boring
Big Tank + Big Fish + Nicely Aquascaped = AWESOME
Big Tank + Planted + Nice Variety of Fish = AWESOME

To the OP seems like you need to change things up in you tank!