I recently calculated that 98% of our net worth is in assets that are either jointly owned with TOD to our 2 kids, or individually owned with spouse as primary beneficiary and kids as 50/50 contingent beneficiaries (and per stirpes). Even our real estate is jointly owned with TOD to the kids. If one of us dies, the survivor gets everything. If we both die at the same time, the kids get everything 50/50, and only the cars and household goods (the other 2%) would potentially go through probate. We also have a will, including living will and durable POA, that we did on legalzoom for less than $200 IIRC.
Our situation is very straightforward... adult children, no prior marriages, no complicated assets or scenarios, and assets that can all be titled with TOD/POD and beneficiaries, and unlikely to exceed estate tax threshold. We spoke with two "reputable" estate attorneys (the ones who are past the stage of offering free steak dinners) and they both spent the entire meeting talking about trusts even after I explained all of the above. So I concluded that, like most other things, DIY makes the most sense for us. YMMV.