Mike, I wonder if people weren't sufficiently aware of instant access, or haven't given you enough feedback about how it's used.
I didn't use instant access for a long time. I'd read about it but didn't understand what it was. Actually it was clear, but I couldn't imagine that functionality could be possible, so assumed I'd misunderstood. When I tried to use it, not knowing/believing exactly what it was, I failed. I used to study with two PDAs running, just so that I could look up words without changing program.
Later on the penny dropped, and another new PlecoDict world opened. Now I use it every day. Recently I've moved away from studying words and use sentences and phrases, which I study using a variety of other Palm apps, because that works better for me than isolated words. Instant access gives what I need for a quick check and nothing more, and works anywhere.
Because of instant access I was able to make the big jump from numbered pinyin in everything, to using characters alone, almost overnight. I can always use instant access to check a character's sound, but it turns out that I can understand or guess many more characters than I thought. Most often I reach for the instant access button and then the word pops into my brain, because I'm not obsessed with fear losing it, knowing that help is always a tap away no matter where I am.
Sure, the main study work could be done in the new document reader, but I'm also using another flashcard-like program which lets me import whole sentences from my lessons. I'd like to keep using my standalone diary program, using CJKOS to enter some characters whenever I can cope, with instant access as my safety net. As an elementary student I'm increasingly proud to put a character or two in the addressbook, or a todo item, and as the full popup text of my routine alarms. Here I can stretch myself hard, because I always have instant access to give me a quick answer when I forget or panic.
Moving from pinyin to characters alone is a major milestone at this stage of my learning, and feeling it's safe to use characters outside of the study context is great fun. I couldn't have done that without Pleco's instant access.