At the very minimum you would probably want one to draw up a will and estate plan.
Neither of which require a lawyer if you are smart. I have had quite a bit of money for quite some time and have never had a need for a lawyer. Nothing fancy to plan. I have no kids, my brother does....they get it all.
The only variable being what the death tax will be at the time. Based on that the strategy only changes to make sure you convert money holdings into non traceable high dollar physical assets that you can give to people without the government stealing your money. You would be surprised at all the collectible extremely high dollar crap out there that trades hands every day for cash only. Some of it so specific that only a small population even knows it exists. I know quite a few people that put money into such stuff a decade or two ago and are now selling the items for 10X plus what they bought it for and they get cash. The secret is to keep your money assets low enough to avoid the tax. A lawyer is useless in this situation.
It also helps to give as much away along the way while you are still alive to make sure the people you want to have it gets it instead of the government....who will simply waste it. If I cannot reduce the money holdings low enough in life to avoid the tax I will make sure a charity gets it instead of the government.