I am not a lawyer (just a vocal contributor on these topics!), and it sounds like you've made up your mind, but I think you've reached a very solid conclusion. As you probably already know, the usual primary reasons for setting up a trust are:
1. Avoiding probate, which you can already largely accomplish for the bulk of your estate as you've outlined
2. Avoiding challenges to your wishes since trusts are much more difficult to overturn, which you've indicated is not a concern
3. Distributing assets in a way other than lump sums all upon your death (usually more important for providing for minor children, or young adults who might not be mature enough to handle a large inheritance)
4. Protecting large estates from certain forms of taxation, which won't be an issue for you (at least not at present)
5. Handling estates with more complicating factors, like prior marriages, business holdings, children from previous marriages, etc. Also protecting assets from possibly greedy, future ex-spouses of your children, as an example.
6. Privacy, since probate is avoided (I think probate proceedings are a matter of public record in many or most states). Sounds like this is not a concern for you at all
7. Providing for future generations such as grandchildren, great-grandchildren, etc. This MIGHT be one area you could think about, if there was ever any desire to set aside funds for future generations, or fearing that one of your children could wind up with a spouse who could run off with half the assets you bequeathed to them. Another concern sometimes expressed is if you die before your spouse, they remarry and co-mingle assets, and your children potentially wind up with nothing when your (former) spouse dies. Only a trust can likely provide protection in these kinds of situations
Anyway, great job on being so educated for how things are handled in your state!