If we get along, we don't need two lawyers. But any ethical lawyer will tell you that one lawyer cannot represent both opposing parties in any litigation, especially in a divorce, even if they agree. You and your spouse have possible areas of conflict that prevent one lawyer from fairly advising both of you. Your spouse may be paying a lot of money in child support, but cannot claim the children as dependents unless you sign an IRS form. Mediators usually recommend that the parties review the settlement with independent counsel before signing.
Many mediators are actually lawyers.
There's no getting away from lawyers. Perhaps not, but you can control legal fees. This is especially true if you use a mediator. Most people are not fighting over the reason for the divorce. They fight over the property, alimony, child support, custody, and visitation.