So I'm in the process of entering everyone in my address book into my Thunderbolt. Problem is when I open the People app now, instead of looking at a short list of people I usually call, I'm faced with a long list of contacts (titled "All"). I realize that if I make use of the grouping option, I can press a couple of buttons and have a shorter list of people to choose from - but I hate pressing more buttons than I have to. So my question is: Is there anyway I can make one of the groups the list I see when I first open the app? Or am I stuck with looking at all of them and pushing those extra buttons?
The very short answer to your question? No.
The longer answer?...
I'm assuming that this is your first smartphone linked to Google, or maybe your first smartphone at all. Either way, the contacts list (or "people" app) is, unlike on a normal phone, also used for email messaging as well as calls, so everything is integrated. Frankly, this is one thing I miss about BlackBerry, because even though the contact list may be very long, when you opened it up, the keyboard popped up and you enter the first few letters of a person's name and it would auto-search and filter the results, as opposed as having to scroll through such a long list.
Now, on the other hand, if you open the phone app, you CAN start to the type the person's name you're trying to call (using T-9 mode on the phone dial pad), and it will auto-search the contact list for any matches that phone numbers assigned to them. Probably the easiest way to do it you're trying to make a call.
Moving contacts to the SIM isn't really a good option. The SIM has limited memory, and only holds the name and primary phone number fields. There is an option to save contacts to the phone's storage, but I'm not sure if there is an easy way to move existing Google contacts to the phone's storage or not. If you were to do that, you could then set your view to only show "phone" contacts and not the Google contacts. I don't recommend it, but I suppose it is possible.
What I do recommend is logging on to Gmail via your computer, going into the contacts folder and "cleaning it up". Everything in the "My Contacts" label is synced with your phone. Google does a pretty good job with it's logic for auto-saving contacts for you, but if you've been using GMail for a while like I have, you're bound to have quite a few listed in there that you have no reason keep and can be delete, or there may be several that can be merged. (Like people whose phone numbers and email addresses are listed under different names, i.e. "John Doe" and "Johnny Doe"). Doing this should at least give you a list that only includes people who are relevant to you.
One benefit to this method is that any contacts you add using the web interface will automatically be synced to the phone, and you can even import lists from Outlook or other email clients, so that can make doing a "mass add" of contacts much easier.