I have had My 30D for 6 months now, and still learning some of the hidden features.
But one I love and really depend on is the spot metering.
Second, the LCD to verify results. when I need reading glasses as it is.
In bright sun, I never worry about it. What you had in the viewer should be fine.
One can always duck under something to see it better. Or tuck it under jacket. Or in the bag.
You can't see the 15 inch screen on your laptop either, so that washes out that theory.
When I'm doing detailed views in close quarters of machinery like under the hood
and things sticking out all around, the point I'm looking at gets missed if on auto multi point focus
otherwise. I'm also using the built in flash.
I find it exceptional and flawless in manual mode and setting the flash output to match my style.
If one were to use the same view in automatic and flash and being within 3 feet to 1 foot of object, it would be deleted repeatedly.
Even last night during our massive Halloween special we do here for all the kids out doors.
We logged in 380 kids who stopped by.
The camera did a wonderful job. The flash as small as it is and the distance I was at, You'd think I had 2 potato masher heads running the show.
I'll always want in the end a full frame sensor, but so far I'm quite impressed.
It can only get better with L in front of it.
The only thing I really want that I don't need is the 80GB viewer Canon came out with.
It matches the features of the camera and same battery.
Now that is cool.