Someone who does not like excess

Solution 1:

prudent - wise or judicious

frugal - requiring few resources

discreet - showing prudence and circumspection

economical - avoiding waste or extravagance

practical - suitable for a particular purpose

Solution 2:

It sounds like being a minimalist to me, although some folks might confuse it with minimalism in art or music.

What is minimalism? If we had to sum it up in a single sentence, we would say, Minimalism is a tool to rid yourself of life’s excess in favor of focusing on what’s important—so you can find happiness, fulfillment, and freedom.

The "Minimalist" disambiguation page on Wikipedia has an entry that points to Simple Living and explains that 'Simple living encompasses a number of different voluntary practices to simplify one's lifestyle. These may include reducing one's possessions, generally referred to as Minimalism...'

There seems to be a lot of variation in what might specifically constitute a minimalist life style, but I think that context will make it less ambiguous.

Solution 3:

In addition to Rayner's suggestions, there are

• parsimonious (avoiding excess)
• stingy (ungenerous)
• miserly (inclined to hoard money)
• Spartan (characterized by self-denial)

Stingy and miserly are pejorative. Spartan might evince a degree of admiration. Parsimonious is purely technical, a neutral evaluation. A solution to a problem might be described as parsimonious, if it is the simplest possible answer.

There are many others.

Solution 4:

The term ascetic comes to mind:

characterized by or suggesting the practice of severe self-discipline and abstention from all forms of indulgence, typically for religious reasons.

• "an ascetic life of prayer, fasting, and manual labor"

• synonyms: austere, self-denying, abstinent, abstemious, self-disciplined, self-abnegating; simple, puritanical, monastic; reclusive, eremitic, hermitic; celibate, chaste

• "an ascetic life"

a person who practices severe self-discipline and abstention.

• synonyms: abstainer, puritan, recluse, hermit, anchorite, solitary; fakir, Sufi, dervish, sadhu; archaiceremite

• "a desert ascetic"

(I just saw this term in a comment on this question.)

Solution 5:

If you feel excess is a bit unethical, then self disciplined would work.

If the issue is monetary, then frugal or shrewd would work.

If you find excess in bad taste, then unostentatious would work.

In general, you are a sensible person.