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Some utilitarians would be on board with that. Some utilitarians think that doesn't maximize utility (e.g. preference utilitarians) or even happiness (e.g. certain objections about unique brain states).
There exist EA people who would be on board with that. I don't know how many. I would think people who think tiling the universe with hedonium is good wouldn't object to wireheading either.
There also exist EA people who aren't utilitarians, even though the overall sensibilities of EA are pretty utilitarian. I don't know how many.
Most EA has much more mundane goals. Preventing malaria or improving nutritional intake of poor rural laborers using low-cost interventions is good whether you subscribe to preference utilitarianism or negative utilitarianism or hedonic utilitarianism.