The disadvantages to higher interest rates are that all loans are more expensive, including credit cards, so it’s best hunker down and keep debt to a minimum.
Lower interest rates mean you pay less interest, can buy “more” home, and possibly pay your mortgage off faster. If you have a mortgage at a higher rate than “today’s” rates, you can refinance to a lower monthly payment, eliminate or lower private mortgage insurance, or trade a variable-rate loan for a fixed-rate loan. The disadvantage is that other instruments that pay interest to you will provide lower yields.